渝东地区寒武系第四阶龙王庙组古环境演化的稳定同位素与主、微量元素证据

任影; 钟大康; 柳慧琳; 梁婷; 孙海涛; 高崇龙; 郑晓薇

doi:10.3799/dqkx.2017.590

渝东地区寒武系第四阶龙王庙组古环境演化的稳定同位素与主、微量元素证据

doi: 10.3799/dqkx.2017.590

1.
东北石油大学地球科学学院, 黑龙江大庆 163318
2.
中国石油大学地球科学学院, 北京 102249
3.
河北省地球物理勘察院, 河北石家庄 065000

基金项目:

国家自然科学基金项目"白音查干凹陷下白垩统腾格尔组白云岩成因机理研究" 41072104

详细信息

作者简介:
任影(1989-), 女, 讲师, 主要从事沉积学与储层地质学研究

通讯作者:
钟大康(1961-)

中图分类号: P595
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- 被引次数: 0
出版历程
- 收稿日期: 2018-03-22
- 刊出日期: 2018-11-15

Isotopic and Elemental Evidence for Paleoenvironmental Evolution of Cambrian Stage 4 Longwangmiao Formation, East Chongqing, China

1.
School of Earth Sciences, Northeast Petroleum University, Daqing 163318, China
2.
College of Geosciences, China University of Petroleum, Beijing 102249, China
3.
Hebei Institute of Geophysical Exploration, Shijiazhuang 065000, China

摘要

摘要: 寒武系第四阶是生命演化史上重要的时间节点.渝东地区寒武系第四阶龙王庙组以碳酸盐岩为主要岩石类型，地层中、下部混积岩发育，生物化石发育程度低.∑（CaO+MgO+LOI）含量分布范围广（74.64%~99.18%），Na₂O、K₂O、Fe₂O₃与MnO含量较高（平均值分别为0.20%、0.27%、0.27%和0.014%），∑（SiO₂+Al₂O₃+Fe₂O₃+P₂O₅+TiO₂）在地层中下部具较高含量（最大值24.00%）；Sr元素含量较低（135×10^-6~407×10^-6），∑REE+Y在地层中部含量较高，∑LREE/∑HREE分布在2~4，具显著正铈异常（δCe=5.6~6.2），配分曲线为平缓右倾模式.全岩与方解石的δ¹³C值分别为-1.5‰~1.1‰ VPDB、-3.4‰ ~+0.5‰ VPDB，δ¹⁸O值分别为-9.7‰ ~-3.5‰ VPDB、-9.8‰~-5.0‰ VPDB；垂向上，两者的δ¹³C值在地层中下部均以负值为主，中上部多为正值.依据δ¹³C、δ¹⁸O、MgO/CaO（0.03%~0.12%）、100×MgO/Al₂O₃（93.1~4 715.4）、B_校（278.7~1 494.2）、Sr/Ba（4.05~58.25）、1 000×Sr/Ca（5.41~14.43）、V/（V+Ni）（0.61~0.78）及U/Th（0.21~1.45）等与沉积环境的关系，推断龙王庙期水体温度在17~25℃，属半咸水-咸水环境；水体深度在早-中期波动频繁；以贫氧-缺氧环境为主，在早-中期、末期为阶段性富氧环境.整体上龙王庙组沉积早-中期受河流注入影响较为明显、陆源碎屑供给充足，具海陆过渡环境特征，沉积中后期为稳定的海相环境.咸水、缺氧的条件及海平面波动频繁并伴有大量陆源碎屑注入所产生的环境压力，是引发渝东地区寒武系第四阶生物消亡的主要环境因素.
- 寒武系 /
- 第四阶 /
- 龙王庙组 /
- 碳酸盐岩 /
- 河流注入 /
- 沉积环境 /
- 地球化学
Abstract: The Cambrian Stage 4 represents a key point in the history of life in Longwangmiao Formation, carbonate is main rocks and diamictite widely distributed at its lower-middle part, with the slight occurrence of bioclast. The major and trace element analyses show that Longwangmiao Formation carbonate has various contents of ∑(CaO+MgO+LOI) from 74.64% to 99.18%, high Na₂O, K₂O, Fe₂O₃ and MnO concentrations (with an average of 0.20%, 0.27%, 0.27% and 0.014%, respectively), low Sr contents (135×10^-6-407×10^-6), gradually decreased contents of ∑(SiO₂+Al₂O₃+Fe₂O₃+ P₂O₅+TiO₂) upward section, extremely positive Ce anomalies (δCe=5.6-6.2) and a distinctive LREE-enriched pattern all the section (∑LREE/∑HREE=2-4), coupled with relatively high contents of ∑REE+Y at its middle part. The whole carbonates possess δ¹³C values from -1.5‰ to 1.1‰ VPDB and δ¹⁸O values from -9.7‰ to -3.5‰ VPDB, while calcites have relatively high δ¹³C values (-3.4‰ to +0.5‰ VPDB) and approximate δ¹⁸O values (-9.8‰ to -5.0‰ VPDB), alongside a gradual increase in carbon isotopic composition of both whole carbonates and calcites from its lower part to the upper section. Geochemical indictors of different palaeoenvironmental factors, involved palaeoclimate (MgO/CaO), seawater temperature and salinity (δ¹³C, δ¹⁸O, 100×MgO/Al₂O₃ and B_{proof read}), relative seawater depth (Sr/Ba, 1 000×Sr/Ca) and redox condition (U/Th, V/(V+Ni)), etc., imply that Longwangmiao Formation deposited at salt-brackish water under 17-25℃ during the transition mainly from the relative oxidizing and paralic environment to the dysaerobic-anaerobic and shallow marine environment, with an abundant riverine influx at its early period and frequent fluctuations of paleoclimate from relatively humid to arid, which would build the environmental stress and then lead to the major biomass reduction.
- Cambrian /
- Stage 4 /
- Longwangmiao Formation /
- carbonate /
- riverine influx /
- depositional environment /
- geochemistry

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图 1 寒武纪重要的地质、生物与地球化学事件

图央阶,伴随着三叶虫(Redlichiid和Olenellid trilobites)的大量消亡,碳酸盐岩的δ¹³C值出现大幅负漂移.海平面变化曲线来源于Haq and Schutter (2008);生物多样性的种属数量来源于Ishikawa et al.(2014);主要的生物数量减少事件与相关的碳酸盐岩δ¹³C曲线来源于Zhu et al.(2006)

Fig. 1. Geological, biological and geochemical events during the Cambrian

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图 2 渝东地区位置、构造及龙王庙组地层、岩相古地理

Fig. 2. The location and structure of East Chongqing as well as the formation and lithofacies paleogeograohy of Longwangmiao Formation

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图 3 渝东地区龙王庙组野外露头与显微镜下照片

岩性图例见图 2

Fig. 3. Field photos and thin section photomicrographs of Longwangmiao Formation at East Chongqing

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图 4 板凳沟剖面龙王庙组碳酸盐岩样品白云石、方解石、碎屑矿物百分含量

岩性图例见图 2

Fig. 4. The dolomite, calcite and detrital mineral percentages of carbonates in Longwangmiao Formation at Bandenggou Section

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图 5 板凳沟剖面龙王庙组碳酸盐岩的δ¹³C-δ¹⁸O交互图

空心圆表示受成岩改造强烈的无效样品

Fig. 5. Crossplot of δ¹³C-δ¹⁸O of carbonates in Longwangmiao Formation at Bandenggou Section

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图 6 板凳沟剖面龙王庙组碳酸盐岩δ¹³C值、δ¹⁸O值、Mn/Sr及MgO/CaO比值

空心圆为依据相应判别标准确定的无效样品.岩性图例见图 2

Fig. 6. δ¹³C values, δ¹⁸O values, Mn/Sr molar ratios and MgO/CaO of carbonate in Longwangmiao Formation at Bandenggou Section

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图 7 板凳沟剖面龙王庙组碳酸盐岩的CaO-MgO、SiO₂-CaO、Al₂O₃-CaO、SiO₂-Al₂O₃、Mg/Ca-Na₂O、Sr-Na₂O、Na₂O-SiO₂、SiO₂-Fe₂O₃、MnO-Fe₂O₃和CaO-Fe₂O₃交互图

Fig. 7. Crossplot of CaO-MgO, SiO₂-CaO, Al₂O₃-CaO, SiO₂-Al₂O₃, Mg/Ca-Na₂O, Sr-Na₂O, Na₂O-SiO₂, SiO₂-Fe₂O₃, MnO-Fe₂O₃, CaO-Fe₂O₃of carbonates in Longwangmiao Formation at Bandenggou Section

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图 8 板凳沟剖面龙王庙组碳酸盐岩的Sr-CaO、Sr-SiO₂、SiO₂-Fe₂O₃、Sr-δ¹⁸O和SiO₂-∑REE+Y交互图

Fig. 8. Crossplot of Sr-CaO, Sr-SiO₂, SiO₂-Fe₂O₃, Sr-δ¹⁸O and SiO₂-∑REE+Y of carbonates in Longwangmiao Formation at Bandenggou Section

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图 9 板凳沟剖面龙王庙组碳酸盐岩的稀土元素(∑REE+Y)配分模式

Fig. 9. ∑REE+Y patterns of carbonates in Longwangmiao Formation at Bandenggou Section

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图 10 板凳沟剖面龙王庙组碳酸盐岩全岩及方解石、白云石组分的δ¹³C-δ¹⁸O交互图

寒武纪海水与灰岩的δ¹³C与δ¹⁸O数据来源于Veizer et al.(1999)和Montañez et al.(2000).全岩分析结果用圆形表示，方解石测试结果用三角形表示，白云石测试结果用四边形表示

Fig. 10. Crossplot of δ¹³C-δ¹⁸O of whole carbonates, calcites and dolomites in Longwangmiao Formation at Bandenggou Section

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图 11 板凳沟剖面龙王庙组部分同位素、元素计算结果及古环境特征

岩性图例同见图 2

Fig. 11. Calculated results of isotopes and elements and palaeoenvironmental characteristics Longwangmiao Formation at Bandenggou Section

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图 12 渝东地区寒武系⁸⁷Sr/ ⁸⁶Sr比值变化

数据来自黄思静等(2002)

Fig. 12. ⁸⁷Sr/ ⁸⁶Sr value variations for the Cambrian, East Chongqing

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图 13 板凳沟剖面龙王庙组碳酸盐岩的V-总碎屑矿物、Ni-总碎屑矿物、U-总碎屑矿物、Th-总碎屑矿物、V/(V+Ni)-总碎屑矿物、U/Th-总碎屑矿物、V/(V+Ni)-∑(SiO₂+Al₂O₃+Fe₂O₃+ P₂O₅+TiO₂)和U/Th-∑(SiO₂+Al₂O₃+Fe₂O₃+P₂O₅+TiO₂)交互图

Fig. 13. Crossplots of V-∑detrital minerals, Ni-∑detrital minerals, U-∑detrital minerals, Th-∑detrital minerals, V/(V+Ni)-∑detrital minerals, U/Th-∑detrital minerals, V/(V+Ni)-∑(SiO₂+Al₂O₃+Fe₂O₃+ P₂O₅+TiO₂) and U/Th-∑(SiO₂+Al₂O₃+Fe₂O₃+ P₂O₅+TiO₂) of carbonates in Longwangmiao Formation at Bandenggou Section

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表 1 渝东地区板凳沟剖面龙王庙组矿物组成、主量元素含量、碳氧同位素组成及部分计算结果

Table 1. Mineral compositions, carbon and oxygen contents, major elements concentrations and calculated results of Longwangmiao Formation at Bandenggou Section, east Chongqing

样品	岩性	主量元素(%)												Σ(CaO+ MgO+LOI) (%)	Σ(SiO₂+Al₂O₃+ Fe₂O₃+TiO₂+ P₂O₅)(%)	MgO/CaO (%/%)	Mn/Sr (mol/mol)	稳定同位素(‰)		矿物组分(%)
样品	岩性	SiO₂	Al₂O₃	Fe₂O₃	MgO	CaO	Na₂O	K₂O	MnO	TiO₂	P₂O₅	LOI	总量	Σ(CaO+ MgO+LOI) (%)	Σ(SiO₂+Al₂O₃+ Fe₂O₃+TiO₂+ P₂O₅)(%)	MgO/CaO (%/%)	Mn/Sr (mol/mol)	δ¹³C	δ¹⁸O	方解石	白云石	硬石膏	石英	斜长石	正长石	菱铁矿	黏土
L1	灰岩	6.34	0.51	0.17	1.27	51.04	0.073	0.115	0.008	0.026	0.010	40.59	100.1005	92.90	7.06	0.02	0.43	0.0	-10.3	1.6	87.8	0	10.5	0	0	0	0
L2	白云岩	4.66	1.76	0.88	17.16	32.34	0.106	0.416	0.030	0.068	0.037	43.00	100.46	92.50	7.41	0.53	2.28	0.1	-6.9	79.5	16.2	0	2.1	0.7	0	0	1.5
L3	白云岩	30.40	10.82	4.39	10.74	15.5	0.392	3.50	0.110	0.42	0.076	24.25	100.60	50.49	46.11	0.69	13.98	0.8	-4.8	54.1	1.2	0	13.6	1.0	2.3	0	27.8
L4	灰岩	5.31	0.51	0.53	1.21	50.73	0.027	0.239	0.007	0.024	0.011	40.93	99.53	92.87	6.39	0.02	0.29	-2.4	-11.7	0	100.0	0	0	0	0	0	0
L5	白云岩	10.99	2.05	0.90	19.17	26.21	0.059	0.586	0.017	0.09	0.024	39.85	99.95	85.23	14.05	0.73	2.03	-1.5	-5.3	85.6	2.6	0	10.1	0	0	0	1.7
L6	灰岩	0.79	0.30	0.57	8.57	44.91	0.027	0.099	0.011	0.013	0.005	44.00	99.30	97.48	1.68	0.19	1.38	0.6	-7.7	47.3	51.2	0	1.5	0	0	0	0
L7	灰岩	4.11	1.07	0.41	4.54	46.72	0.192	0.528	0.008	0.034	0.016	41.87	99.50	93.13	5.64	0.10	0.27	-1.2	-9.3	18.8	71.3	0	3.0	1.7	5.2	0	0
L8	灰岩	7.75	2.26	0.87	18.08	29.07	0.868	0.427	0.019	0.142	0.037	41.24	100.76	88.39	11.06	0.62	2.69	-0.9	-8.1	0	66.8	0	33.2	0	0	0	0
L9	白云岩	8.23	1.28	1.31	18.25	27.9	0.222	0.591	0.016	0.069	0.023	41.48	99.37	87.63	10.91	0.65	2.20	-0.5	-8.3	88.0	1.7	0	5.1	1.8	2.3	1.1	0
L10	白云岩	4.24	0.76	0.69	19.39	29.49	0.049	0.558	0.022	0.04	0.019	44.32	99.58	93.20	5.75	0.66	2.60	-1.3	-6.1	94.6	1.5	0	1.8	2.1	0	0	0
L11	灰岩	1.32	0.52	0.46	5.63	48.48	0.049	0.325	0.017	0.025	0.014	43.39	100.23	97.50	2.34	0.12	1.25	-1.5	-7.6	22.5	75.5	0	0	2.1	0	0	0
L12	白云岩	26.10	4.57	1.63	10.92	23.86	0.867	1.58	0.025	0.175	0.058	30.73	100.59	65.51	32.60	0.46	4.48	-1.7	-5.9	52.5	18.5	0	20.0	1.8	0	0	7.2
L13	白云岩	18.75	4.14	1.39	14.63	25.13	0.308	0.865	0.021	0.209	0.069	34.43	99.94	74.19	24.56	0.58	4.11	-1.1	-3.1	75.3	1.3	0	12.5	1.8	3.7	0	5.4
L14	灰岩	3.40	0.74	0.24	0.53	52.2	0.282	0.157	0.014	0.036	0.011	41.79	99.40	94.52	4.43	0.01	0.67	-1.2	-13.4	0	91.0	0	0.3	8.8	0	0	0
L15	灰岩	1.89	0.33	0.14	0.49	54.56	0.193	0.02	0.015	0.015	0.020	42.82	100.49	97.87	2.40	0.01	0.59	-1.5	-13.4	0	85.6	0	1.5	12.8	0	0	0
L16	灰岩	8.14	1.59	0.41	2.58	46.23	0.849	0.108	0.018	0.055	0.040	39.30	99.32	88.11	10.24	0.06	0.86	-0.4	-9.3	12.1	55.2	0	6.1	26.7	0	0	0
L17	灰岩	6.52	1.45	0.38	1.35	48.78	0.723	0.109	0.019	0.063	0.035	40.02	99.45	90.15	8.45	0.03	0.85	0.1	-3.5	6.3	80.5	0	7.3	5.9	0	0	0
L18	灰岩	8.63	1.57	0.44	1.56	47.25	0.758	0.123	0.017	0.078	0.033	38.88	99.34	87.69	10.75	0.03	0.70	-0.2	-9.0	5.4	74.1	0	10.4	0	0	0	0
L19	灰岩.	4.11	1.03	0.42	1.97	49.85	0.469	0.115	0.015	0.035	0.012	41.48	99.51	93.30	5.61	0.04	0.46	0.0	-11.8	9.6	76.8	0	3.7	9.9	0	0	0
L20	混积岩	11.42	2.34	0.53	2.65	43.68	0.827	0.403	0.012	0.103	0.034	37.58	99.58	83.91	14.43	0.06	0.37	-0.6	-9.5	9.6	46.5	0	13.8	0	21.9	0	8.1
L21	混积岩	16.08	4.14	1.50	11.80	28.15	1.600	0.736	0.025	0.175	0.057	35.41	99.67	75.36	21.95	0.42	2.17	0.2	-7.4	41.2	19.1	1	8.2	0	20.5	0	10.0
L22	混积岩	11.26	2.66	0.98	7.45	37.34	1.070	0.366	0.019	0.124	0.032	38.11	99.41	82.90	15.06	0.20	0.59	0.4	-8.2	37.7	40.4	0.7	7.6	13.6	0	0	0
L23	混积岩	10.74	2.24	0.86	6.41	39.66	1.080	0.184	0.020	0.105	0.036	38.22	99.56	84.29	13.98	0.16	0.63	0.5	-10.5	26.5	40.4	0.6	0	0	21.1	0	5.2
L24	混积岩	13.13	2.76	1.18	9.31	34.46	1.320	0.232	0.026	0.155	0.040	37.07	99.68	80.84	17.27	0.27	1.57	0.6	-8.7	39.6	28.2	0.5	8.1	23.5	0	0	0
L25	混积岩	11.46	2.29	0.83	7.08	39.94	1.200	0.152	0.021	0.097	0.034	37.68	100.78	84.70	14.71	0.18	1.06	0.1	-7.9	26.2	34.6	0	9.3	0	26.2	0	5.7
L26	白云岩	9.75	1.79	1.50	17.53	26.91	0.943	0.109	0.037	0.087	0.027	40.98	99.66	85.42	13.15	0.65	4.50	0.2	-9.7	80.8	0.5	0	5.7	13	0	0	0
L27	白云岩	16.05	3.46	1.21	16.36	24.35	1.410	0.264	0.025	0.169	0.054	37.01	100.36	77.72	20.94	0.67	4.11	-0.1	-4.8	64.1	0	0.4	7.4	24.8	0	0	3.3
L28	混积岩	24.28	4.76	0.91	12.72	22.76	1.770	0.724	0.020	0.236	0.097	32.14	100.42	67.62	30.28	0.56	3.67	0.1	-3.3	48.1	1.9	1	12	0	34.7	0	2.4
L29	混积岩	27.85	3.76	1.05	6.73	29.21	0.862	0.44	0.020	0.257	0.119	30.43	100.73	66.37	33.04	0.23	5.14	-3.2	-6.4	35.3	32.5	0	29.6	0	2.7	0	0
L30	白云岩	19.73	6.31	2.14	17.3	20.31	0.177	1.59	0.030	0.338	0.066	32.25	100.24	69.86	28.58	0.85	3.85	-9.1	-7.2	63.9	0	0	12.5	1.4	1.1	0	21
L31	灰岩	20.09	2.43	0.89	2.82	38.88	0.042	0.528	0.017	0.169	0.101	33.28	99.25	74.98	23.68	0.07	13.09	-7.5	-5.0	3.5	74.3	0	19.1	0	0	0	3.2
L32	白云岩	18.36	4.46	1.27	18.57	22.58	0.053	0.885	0.028	0.233	0.073	34.19	100.70	75.34	24.40	0.82	4.33	-1.6	-6.2	70.6	4.2	0	14	1.3	0	0	9.8
L33	白云岩	26.45	4.00	1.65	15.09	19.35	0.345	1.29	0.027	0.208	0.086	30.81	99.31	65.25	32.39	0.78	3.82	-1.4	-6.1	68.2	0	0	23.9	3.4	1.3	0	3.3
L34	白云岩	16.72	4.37	1.62	16.97	22.64	0.121	1.27	0.027	0.209	0.064	35.31	99.32	74.92	22.98	0.75	3.45	-1.2	-4.9	71.2	1.2	0	11.1	0.9	0	0	15.6
L35	白云岩	15.09	3.76	1.35	18.2	23.3	0.110	0.958	0.027	0.164	0.045	36.83	99.83	78.33	20.41	0.78	3.19	-1.2	-6.2	81.8	0	0	12.8	1.1	0	0	4.4
L36	灰岩	6.54	1.29	0.81	1.52	48.86	0.140	0.357	0.043	0.046	0.023	39.81	99.44	90.19	8.71	0.03	3.05	-1.3	-10.5	5.3	82.7	0	10.9	0	1.1	0	0
L37	白云岩	10.33	2.97	2.64	17.01	25.45	0.073	1.18	0.054	0.166	0.063	39.33	99.27	81.79	16.17	0.67	6.78	-2.5	-11.4	83.7	0	0	7.2	1	0	0	8.1
L38	白云岩	4.29	1.00	2.82	14.14	34.08	0.220	0.283	0.098	0.05	0.024	42.21	99.22	90.43	8.18	0.41	11.35	-0.3	-7.9	75.6	14.7	0	5.5	0	3.1	1.1	0
L39	混积岩	39.66	6.63	1.41	2.44	24.08	0.412	3.594	0.024	0.397	0.178	20.62	99.45	47.14	48.28	0.10	3.25	-2.1	-10.4	6.1	35.1	0	21.5	20.5	5	0	11.7
L40	碎屑岩	59.94	7.63	2.00	2.24	12.45	0.181	3.522	0.022	0.524	0.288	11.49	100.29	26.18	70.38	0.18	4.07	-4.3	-8.5	0	21.8	0	53.4	5.7	0	0	19
L41	灰岩	1.38	0.53	0.36	5.09	48.17	0.058	0.154	0.013	0.022	0.008	43.67	99.46	96.93	2.30	0.11	0.78	0.6	-10.7	28.6	70.4	0	1	0	0	0	0
L42	碎屑岩	54.30	12.68	4.50	4.15	8.8	0.202	4.51	0.023	0.771	0.162	10.34	100.42	23.27	72.41	0.47	7.16	-1.7	-7.9	0	12	0	53	6	1.2	0	27.8
L43	灰岩	18.43	3.67	1.62	3.99	37.23	0.415	1.43	0.035	0.211	0.075	33.42	100.53	74.64	24.01	0.11	1.76	-0.7	-9.7	0	95.8	0	0	0	0	0	4.2
L44	灰岩	12.69	3.49	1.26	3.33	41.2	0.193	1.23	0.031	0.18	0.046	35.75	99.40	80.28	17.67	0.08	1.24	-0.5	-12.7	9.7	59	0	13.8	3.3	5.6	0	8.6
L45	灰岩	15.75	4.23	1.56	5.16	36.54	0.312	1.46	0.031	0.212	0.044	34.22	99.52	75.92	21.80	0.14	1.48	-0.2	-9.3	21.7	51	0	9.8	2.8	4.1	0	10.6
L46	灰岩	6.30	1.81	0.86	2.50	47.38	0.165	0.681	0.023	0.091	0.023	39.43	99.26	89.31	9.08	0.05	0.77	0.1	-9.0	11.2	73.9	0	6.3	3.8	1.7	0	3.1
L47	灰岩	13.41	3.02	0.87	2.12	43.05	0.106	1.33	0.022	0.152	0.041	35.52	99.64	80.69	17.49	0.05	0.70	-0.4	-11.5	6.7	69.1	0	17.8	2.5	0	0	4
L48	碎屑岩	47.54	11.36	2.28	2.65	15.13	0.314	4.96	0.019	0.586	0.109	14.53	99.48	32.31	61.88	0.18	2.77	-1.7	-12.2	2.9	18.1	0	25.8	13.4	2.6	0	37.2
L49	白云岩	5.30	1.66	1.28	12.24	35.82	0.354	0.538	0.032	0.053	0.024	42.16	99.46	90.22	8.32	0.34	2.42	0.8	-7.4	68.9	24.8	0	2.2	0	4	0	0
L50	灰岩	4.53	1.12	0.36	1.28	50.55	0.121	0.453	0.015	0.05	0.019	40.93	99.43	92.76	6.08	0.03	0.50	-0.5	-11.7	6.4	87.4	0	2.6	2	1.7	0	0
L51	灰岩	2.69	0.85	0.35	1.27	52.95	0.146	0.253	0.014	0.033	0.016	42.09	100.66	96.31	3.94	0.02	0.59	-0.1	-11.7	5.1	92.8	0	0.7	0	1.4	0	0
L52	灰岩	1.80	0.54	0.40	3.7	49.56	0.070	0.165	0.014	0.018	0.009	42.99	99.27	96.25	2.77	0.07	0.73	0.6	-7.6	0	89.1	0	0	0	0	10.9	0
L53	灰岩	0.88	0.43	0.30	4.37	49.64	0.080	0.088	0.013	0.013	0.006	43.5	99.32	97.51	1.63	0.09	0.64	0.3	-7.9	22.4	77.4	0	0.2	0	0	0	0
L54	灰岩	0.73	0.73	0.38	0.59	54.25	0.021	0.054	0.006	0.022	0.102	42.75	99.64	97.59	1.96	0.01	2.57	-1.9	-8.4	0	99.7	0	0.3	0	0	0	0
L55	白云岩.	0.75	0.41	0.40	10.56	42.62	0.032	0.126	0.016	0.017	0.006	44.55	99.49	97.73	1.58	0.25	1.26	0.5	-11.9	56.9	42.4	0	0.7	0	0	0	0
L56	灰岩	2.81	1.06	0.49	7.67	44.31	0.032	0.383	0.013	0.029	0.016	42.48	99.29	94.46	4.41	0.17	0.83	0.6	-11.2	40.9	54.2	0	4.9	0	0	0	0
L57	灰岩	1.67	0.55	0.65	2.80	51.63	0.029	0.175	0.014	0.02	0.009	42.44	99.99	96.87	2.90	0.05	0.69	0.5	-8.7	9	90.5	0	0.5	0	0	0	0
L58	灰岩	0.87	0.33	0.61	4.71	49.45	0.034	0.091	0.017	0.01	0.006	43.28	99.41	97.44	1.83	0.10	1.17	0.4	-10.4	26.7	71.2	0	2.1	0	0	0	0
L59	灰岩	2.04	0.47	0.34	2.63	52.01	0.030	0.156	0.020	0.015	0.013	42.45	100.17	97.09	2.88	0.05	1.14	0.2	-9.2	16.1	79.8	0	4.1	0	0	0	0
L60	灰岩	1.51	0.58	0.59	8.48	44.53	0.036	0.189	0.024	0.019	0.009	43.56	99.53	96.57	2.71	0.19	2.02	0.4	-2.0	43.8	52.7	0	3.5	0	0	0	0
L61	灰岩	0.51	0.31	0.29	6.98	47.26	0.036	0.098	0.011	0.012	0.005	43.87	99.38	98.11	1.13	0.15	0.95	0.0	-9.0	34.1	65.1	0	0.8	0	0	0	0
L62	灰岩.	1.09	0.47	0.34	5.45	48.32	0.033	0.117	0.014	0.014	0.007	43.63	99.49	97.4	1.92	0.11	0.95	0.3	-11.3	37.3	61.7	0	1	0	0	0	0
L63	灰岩	1.10	0.35	0.27	4.02	50.68	0.029	0.09	0.012	0.011	0.005	43.39	99.96	98.09	1.74	0.08	0.95	-0.1	-9.0	21.4	70.7	0	7.9	0	0	0	0
L64	灰岩	0.76	0.35	0.29	6.82	48.39	0.027	0.114	0.012	0.015	0.004	43.76	100.54	98.97	1.42	0.14	1.17	0.3	-12.0	46.2	52.9	0	0.9	0	0	0	0
L65	灰岩	2.30	0.46	0.17	2.17	51.63	0.025	0.171	0.007	0.019	0.008	42.44	99.40	96.24	2.96	0.04	0.50	0.7	-8.3	8.5	89.8	0	1.7	0	0	0	0
L66	灰岩	0.33	0.13	0.31	6.13	49.15	0.019	0.035	0.012	0.006	0.003	43.9	100.03	99.18	0.78	0.12	0.89	0.7	-8.3	31.8	67.9	0	0.3	0	0	0	0
L67	白云岩.	2.16	0.51	0.36	10.73	42.13	0.025	0.185	0.013	0.02	0.009	43.61	99.75	96.47	3.06	0.25	1.67	1.9	-6.8	60.9	35.4	0	3.7	0	0	0	0
L68	灰岩	2.04	0.43	0.17	0.48	54.98	0.019	0.146	0.008	0.017	0.008	42.13	100.43	97.59	2.67	0.01	0.60	0.9	-9.0	0	94.6	0	5.4	0	0	0	0
L69	白云岩.	28.01	1.88	0.53	13.49	22.2	0.083	1.21	0.019	0.039	0.034	32.14	99.64	67.83	30.49	0.61	3.99	2.0	-6.7	69.7	3.8	0	22.2	4.3	0	0	0
L70	灰岩	5.52	0.23	0.13	4.55	47.52	0.021	0.061	0.011	0.009	0.005	42.68	100.74	94.75	5.89	0.10	0.90	0.0	-8.7	25.3	74.7	0	0	0	0	0	0
L71	灰岩	1.71	0.26	0.35	8.11	45.37	0.031	0.078	0.016	0.009	0.005	43.59	99.53	97.07	2.33	0.18	1.47	0.5	-8.6	0	98.1	0	1.9	0	0	0	0
L72	白云岩	5.71	0.66	0.68	11.74	38.54	0.037	0.24	0.023	0.019	0.011	42.3	99.96	92.58	7.08	0.30	2.23	1.1	-7.4	61.6	33.8	0	4.6	0	0	0	0
L73	灰岩	1.86	0.40	0.28	2.16	51.79	0.022	0.14	0.015	0.013	0.005	42.61	99.30	96.56	2.56	0.04	0.79	0.2	-8.4	20.9	77.9	0	1.2	0	0	0	0
L74	白云岩	1.34	0.37	0.42	13.70	38.74	0.053	0.072	0.019	0.01	0.009	45.06	99.79	97.5	2.15	0.35	1.61	0.5	-2.2	64.1	35.6	0	0.3	0	0	0	0
L75	白云岩	4.67	0.55	0.45	19.76	29.56	0.032	0.182	0.014	0.017	0.010	44.10	99.35	93.42	5.70	0.67	1.87	0.7	-5.2	94.3	1.5	0	4.1	0	0.2	0	0
L76	白云岩	0.48	0.25	1.66	19.21	31.84	0.048	0.094	0.058	0.011	0.004	46.03	99.69	97.08	2.41	0.60	6.78	-3.5	-7.5	95.1	4.2	0	0	0.7	0	0	0
L77	白云岩	20.5	3.46	1.25	7.19	32.25	0.724	0.533	0.029	0.071	0.039	33.77	99.82	73.21	25.32	0.22	2.70	0.0	-8.7	35	30.1	0	11.7	3.5	12.6	0	7.2
L78	灰岩	1.62	0.22	0.51	4.54	49.34	0.030	0.074	0.015	0.008	0.003	43.21	99.57	97.09	2.36	0.09	1.38	0.5	-8.5	30.7	68.7	0	0.5	0	0	0	0
L79	灰岩	0.35	0.27	0.64	6.84	47.36	0.053	0.085	0.017	0.011	0.004	43.92	99.55	98.12	1.28	0.14	1.63	2.7	-2.3	0	100	0	0	0	0	0	0
L80	灰岩	0.38	0.14	0.09	0.92	55.57	0.018	0.049	0.006	0.005	0.004	42.22	99.40	98.71	0.62	0.02	0.44	-0.5	-8.5	7	92.2	0	0.8	0	0	0	0
L81	灰岩	3.56	0.97	0.42	3.97	48.3	0.032	0.377	0.010	0.031	0.015	41.93	99.62	94.2	5.00	0.08	0.79	0.6	-8.6	0	98.4	1.6	0	0	0	0	0
L82	白云岩	0.83	0.22	0.73	9.36	44.33	0.063	0.063	0.019	0.01	0.005	44.4	100.03	98.09	1.80	0.21	2.14	0.8	-7.1	57.6	42.4	0	0	0	0	0	0
L83	灰岩	6.04	1.09	0.31	3.11	48.05	0.035	0.488	0.008	0.034	0.023	40.13	99.32	91.29	7.50	0.06	0.64	1.1	-8.1	23.8	67.4	0	8.8	0	0	0	0
注：受成岩改造明显的样品用蓝色字体标注，对应的主量元素数据不能用来进行古海洋环境的分析。

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表 2 板凳沟剖面龙王庙组碳酸盐岩方解石、白云石组分的碳氧同位素组成

Table 2. δ¹³C and δ¹⁸O values of calcites and dolomites of carbonate in Longwangmiao Formation at Bandenggou Section

样品	方解石		白云石		样品	方解石		白云石
样品	δ¹³C	δ¹⁸O	δ¹³C	δ¹⁸O	样品	δ¹³C	δ¹⁸O	δ¹³C	δ¹⁸O
L2	-1.4	-8.7	0.1	-6.9	L61	0.0	-9.0	1.2	-7.3
L5	-3.4	-6.2	-1.5	-5.3	67	0.3	-9.1	1.9	-6.8
L20	-0.6	-9.5	0.5	-6.6	L69	0.1	-8.5	2.0	-6.8
L32	-1.9	-5.9	-1.2	-6.2	L72	-0.5	-9.1	1.1	-7.4
L38	-1.3	-9.1	-0.3	-7.9	L75	-0.2	-5.0	0.7	-5.2
L41	0.4	-8.7	1.3	-6.9	L76	-0.1	-9.8	1.1	-8.0
L49	-0.4	-9.1	0.8	-7.4	L83	0.5	-9.1	1.7	-7.4
L54	0.4	-9.2	0.8	-8.3

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表 3 渝东地区板凳沟剖面龙王庙组微量元素含量及部分计算结果

Table 3. Trace element concentrations and calculated results of Longwangmiao Formation at Bandenggou Section, East Chongqing

样品	微量元素(10^-6)																						ΣREE	L/H	δCe	δEu
样品	V	Ni	Sr	B	Ba	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Y	Cr	Co	ΣREE	L/H	δCe	δEu
L7	7.35	3.98	363	0.32	31.00	6.79	10.40	1.23	4.16	0.76	0.12	0.62	0.11	0.50	0.11	0.28	0.06	0.29	0.04	3.15	9.95	1.25	30.07	3.55	6.08	0.77
L11	5.61	2.81	168	0.15	17.20	7.61	12.10	1.48	5.24	1.04	0.22	0.98	0.19	1.02	0.22	0.60	0.10	0.59	0.08	6.84	6.83	0.88	39.4	2.36	6.06	0.98
L16	10.70	2.96	258	0.26	16.40	9.93	15.90	1.94	6.87	1.26	0.21	1.01	0.17	0.81	0.16	0.45	0.08	0.43	0.06	4.94	11.10	1.02	46.09	3.62	6.09	0.82
L17	8.82	3.70	277	0.13	17.00	9.74	15.60	1.91	6.76	1.26	0.21	1.02	0.18	0.87	0.18	0.49	0.09	0.47	0.07	5.32	10.90	1.37	46.00	3.37	6.08	0.81
L18	10.10	5.07	303	0.11	20.40	10.10	17.00	2.14	7.61	1.45	0.23	1.18	0.21	1.03	0.21	0.60	0.10	0.58	0.08	6.15	12.40	2.04	50.81	3.14	6.10	0.77
L20	14.00	6.04	407	0.35	44.10	7.64	12.80	1.63	5.91	1.14	0.18	0.90	0.17	0.85	0.18	0.52	0.10	0.58	0.08	5.19	16.00	2.35	40.69	2.57	6.05	0.78
L43	21.30	10.20	246	0.81	94.50	21.20	35.40	4.31	15.80	2.95	0.33	2.42	0.45	2.22	0.46	1.30	0.22	1.21	0.17	14.30	21.20	6.53	106.86	2.98	6.20	0.54
L46	11.70	6.64	371	0.50	45.90	8.19	13.50	1.84	6.90	1.41	0.25	1.05	0.21	1.06	0.22	0.62	0.11	0.61	0.09	6.65	13.80	2.94	45.55	2.38	5.77	0.89
L52	4.60	2.65	237	0.02	12.40	2.83	4.32	0.53	1.81	0.34	0.08	0.27	0.05	0.24	0.05	0.13	0.03	0.16	0.02	1.52	6.69	0.68	13.50	2.76	5.95	1.15
L53	3.52	2.24	253	0.12	9.78	5.56	8.60	1.09	3.91	0.83	0.14	0.66	0.13	0.59	0.11	0.27	0.04	0.21	0.03	3.76	5.35	0.47	27.06	2.90	5.87	0.83
L57	5.30	3.14	250	0.27	11.50	5.13	7.50	0.97	3.46	0.67	0.12	0.52	0.10	0.52	0.11	0.29	0.06	0.29	0.04	3.24	5.55	1.01	24.34	2.75	5.67	0.89
L59	7.82	3.08	218	0.05	9.07	5.20	8.15	0.99	3.31	0.57	0.16	0.45	0.08	0.37	0.07	0.18	0.03	0.15	0.02	2.26	5.82	0.47	23.02	3.96	6.05	1.38
L60	6.26	3.41	147	0.10	18.70	4.38	6.76	0.84	2.94	0.56	0.11	0.43	0.08	0.38	0.08	0.20	0.04	0.18	0.02	2.44	5.94	0.3	21.22	2.80	5.57	0.93
L63	4.60	2.10	157	0.16	7.85	4.53	6.53	0.86	3.03	0.58	0.11	0.46	0.09	0.46	0.09	0.24	0.04	0.20	0.03	3.05	5.93	0.47	17.76	2.65	6.15	0.85
L65	6.93	2.23	172	0.10	9.50	3.34	5.68	0.71	2.53	0.54	0.09	0.38	0.08	0.40	0.08	0.22	0.04	0.24	0.04	2.31	4.32	0.21	10.84	3.11	5.74	1.20
L66	3.50	1.84	167	0.16	5.15	2.43	3.47	0.43	1.51	0.29	0.07	0.22	0.04	0.19	0.04	0.11	0.02	0.12	0.02	1.22	5.43	0.47	22.41	2.58	5.75	0.77
L68	4.95	2.02	166	0.02	13.10	4.52	6.82	0.88	3.18	0.65	0.10	0.48	0.11	0.52	0.11	0.29	0.05	0.27	0.04	3.28	4.47	0.07	13.36	3.93	5.87	1.23
L70	3.30	1.16	151	0.08	5.37	3.21	4.60	0.55	1.89	0.32	0.08	0.25	0.04	0.18	0.04	0.09	0.02	0.10	0.02	1.12	5.85	0.14	28.28	5.02	6.07	1.01
L73	4.31	1.51	235	0.13	7.77	5.11	10.20	1.43	5.48	1.14	0.22	0.73	0.13	0.48	0.08	0.17	0.03	0.14	0.02	2.11	4.72	0.32	13.24	3.66	5.90	1.10
L78	3.11	1.94	135	0.02	6.68	2.75	4.46	0.58	2.10	0.42	0.09	0.29	0.05	0.24	0.05	0.11	0.02	0.12	0.02	1.28	4.53	0.18	11.16	3.54	5.99	1.10
L80	2.72	1.53	168	0.37	4.49	2.37	3.81	0.48	1.64	0.33	0.07	0.22	0.04	0.18	0.04	0.10	0.02	0.11	0.02	1.11	8.26	1.04	22.27	2.50	6.08	0.74
L81	9.71	3.19	156	0.29	18.00	3.95	6.92	0.90	3.34	0.69	0.10	0.48	0.1	0.50	0.11	0.29	0.06	0.29	0.04	2.99	7.19	1.01	24.97	2.34	6.18	0.72
L83	8.52	2.94	154	0.32	21.70	4.17	7.71	1.01	3.72	0.78	0.11	0.55	0.12	0.62	0.13	0.39	0.07	0.42	0.06	3.67			30.07	3.55	6.08	0.77
海水						3.57	0.79	0.51	2.34	0.46	0.12	0.71	0.12	0.860	0.25	0.83	0.12	0.82	0.16	18.400

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