海平面变化在湖南西部桑植地区栖霞组富有机碳沉积物形成中的作用

韦恒叶; 汪建国; 遇昊; 黄宝华

doi:10.3799/dqkx.2013.027

海平面变化在湖南西部桑植地区栖霞组富有机碳沉积物形成中的作用

doi: 10.3799/dqkx.2013.027

韦恒叶^{1, 2,},
汪建国³,
遇昊^{3, 4},
黄宝华²

1.
东华理工大学核资源与环境重点实验室，江西南昌 330013
2.
东华理工大学地球科学学院，江西南昌 330013
3.
中国科学院地质与地球物理研究所，北京 100029
4.
中国科学院大学，北京 100049

基金项目:

国家自然科学基金项目 40839907

东华理工大学核资源与环境教育部重点实验室开放基金 NRE1213

详细信息

作者简介:
韦恒叶(1980－)，男，博士，讲师，主要从事沉积与地球化学教学与研究.E-mail：weihengye@yahoo.com.cn

中图分类号: P588.2
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出版历程
- 收稿日期: 2012-04-15
- 刊出日期: 2013-03-01

Role of Sea Level Fluctuation on the Formation of Organic-Carbon-Rich Sediments in the Chihsian Formation in Sangzhi Area, Western Hunan Province

WEI Heng-ye^{1, 2
,},
WANG Jian-guo³,
YU Hao^{3, 4},
HUANG Bao-hua²

1.
State Key Laboratory Breeding Base of Nuclear Resources and Environment, East China Institute of Technology, Nanchang 330013, China
2.
Department of Earth Science, East China Institute of Technology, Nanchang 330013, China
3.
Institute of Geology and Geophysics, Chinese Academy of Science, Beijing 100029, China
4.
University of Chinese Academy of Sciences, Beijing 100049, China

摘要

摘要: 湖南西部桑植地区中二叠统栖霞组地层旋回性明显，有机质也呈周期性变化.研究其有机质聚集堆积控制因素将有助于理解海平面变化在富有机碳沉积物形成过程中的作用.选择其中一个旋回作为研究目的层段，通过黄铁矿形态以及地球化学参数有机碳TOC、硫同位素、DOP以及微量元素的研究发现，初级生产力参数Ba、Ni、Cu和Zn的变化与TOC含量的变化一致，有机质聚集堆积主要受海洋表层初级生产力的控制，底部水体氧化还原条件与初级生产力有关.有机质的堆积最终归因于高频相对海平面变化，海平面快速上升带来丰富的营养物质，提高海洋表层生物生产力，海底有机质的分解消耗大量氧气，氧需求量的增加形成底部水体贫氧-厌氧环境.
- 初级生产力 /
- 氧化还原条件 /
- 栖霞组 /
- 相对海平面变化
Abstract: The Middle Permian Chihsian Formation in Sangzhi area in western Hunan Province shows remarkable cyclicity, where organic matter cycles also occurred. The study of origin of organic matter accumulation in the Chihsian Formation helps understand the role of sea level fluctuation on the formation of organic-carbon-rich sediments. Using a cycle as the study interval, based on the study of pyrite morphology and geochemical parameters, such as TOC, δ³⁴S, DOP and trace elements, we find out that the variation of ocean surface water primary productivity parameters, such as Ba, Ni, Cu and Zn, are consistent with TOC contents, suggesting organic matter accumulation was controlled by primary productivity. The redox condition in bottom water is related to primary productivity. The ultimate origin for the organic matter accumulation should be the high-frequency sea level fluctuation. Rapid sea level rising brought rich nutrients, flourishing surface water biologic productivity. The decomposition of organic matter from dead body demanded more oxygen concentration, resulting in dysoxic-anoxic environment in bottom water.
- primary productivity /
- redox condition /
- Chihsian Formation /
- relative sea level change

HTML全文

图 1 剖面地理位置

Fig. 1. Geographical location of the Sangzhi section

下载: 全尺寸图片幻灯片

图 2 桑植剖面研究层段的总体面貌、岩性柱以及相对海平面变化

C1和C2为海平面变化旋回，CS为旋回组

Fig. 2. General view of the study interval, the litho-column and relative sea level change at the Sangzhi section

下载: 全尺寸图片幻灯片

图 3 样品岩石薄片

单偏光；a.钙质页岩，见腕足刺、具疹孔腕足壳以及波纹叶片状腕足壳(箭头)，ED14；b.钙质页岩，由有机质、细粒灰泥以及部分小型腕足(箭头)组成，见细纹层组构，ED15；c.灰岩透镜体，由泥晶组成，ED16；d.泥质灰岩，富含有机质，ED17；e.泥质灰岩，镜下见到微纹层状组构，而宏观上却没有纹层状结构，ED18；f.海百合灰岩，箭头指向海百合碎屑，ED21

Fig. 3. Thin sections of the samples

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图 4 栖霞组中部黄铁矿扫描电镜二次电子图像

a.松散的草莓状黄铁矿，ED15；b.草莓状黄铁矿被自形黄铁矿包围，ED15；c.团块状黄铁矿，ED15；d.自形黄铁矿，ED16

Fig. 4. Secondary electron (SE) SEM images of pyrite from the middle Chihsian Formation

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图 5 桑植剖面详细岩性柱以及研究层段TOC、微量元素含量(Ba、Ni、Cu、Zn、Mo和U)、微量元素比值(Ni/Co、V/Sc)、DOP和δ³⁴S同位素组成变化特征

Fig. 5. Detailed log of the Sangzhi section and variations in TOC, trace elements concentrations (Ba, Ni, Cu, Zn, Mo, U), trace element ratios (Ni/Co, V/Sc), DOP, and δ³⁴S isotopic composition through the study interval

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表 1 微量元素、DOP及TOC数据

Table 1. Trace element, DOP and TOC data

样品号	ED11	ED12	ED13	ED14	ED15	ED16	ED17	ED18	ED19	ED20	ED21
Li	1.69	2.01	3.89	17.36	21.54	1.84	3.13	14.12	10.51	4.49	2.53
Be	0.02	0.12	0.13	0.37	0.26	0.11	0.13	0.23	0.25	0.12	0.10
Sc	1.29	1.92	1.52	2.49	2.21	1.93	1.96	1.73	2.46	1.64	1.52
V	3.07	8.97	7.99	42.92	35.55	4.09	4.99	21.63	23.37	3.96	2.87
Cr	6.53	3.69	7.90	21.33	28.17	17.84	5.54	17.04	30.92	8.24	16.76
Co	0.85	0.82	0.77	1.58	0.99	0.89	0.81	0.88	0.88	0.69	0.75
Ni	4.44	2.87	2.88	13.01	10.36	2.87	3.82	5.72	6.32	3.80	2.76
Cu	0.52	0.35	0.50	5.01	4.18	1.28	0.71	2.02	3.59	0.66	0.12
Zn	7.52	8.27	7.97	31.48	23.08	8.57	8.74	14.11	21.08	9.73	8.42
Ga	0.07	0.17	0.23	1.80	1.02	0.15	0.21	0.78	0.54	0.24	0.07
Rb	0.18	0.69	0.71	6.60	3.70	0.94	0.92	2.35	2.59	0.56	0.32
Sr	1 309	1 256	907	369	223	977	974	451	654	968	1 128
Y	1.09	1.74	2.12	5.71	3.80	1.66	1.88	3.98	4.77	3.86	3.24
Zr	0.56	2.99	4.29	15.06	10.19	1.67	3.37	7.73	7.68	3.36	2.62
Nb	0.49	0.48	0.52	1.79	1.24	0.70	0.61	1.09	1.09	0.54	0.45
Mo	0.24	0.52	0.82	3.20	2.03	0.46	0.31	0.42	0.35	0.22	0.27
Cs	0.03	0.07	0.09	0.68	0.48	0.10	0.10	0.28	0.22	0.08	0.05
Ba	3.53	8.46	6.68	21.67	13.36	5.88	6.05	10.31	11.86	7.66	7.18
Hf	0.02	0.10	0.12	0.42	0.29	0.05	0.11	0.23	0.23	0.11	0.09
Ta	0.04	0.05	0.05	0.13	0.09	0.04	0.04	0.08	0.08	0.05	0.04
Tl	0.04	0.06	0.05	0.25	0.29	0.05	0.05	0.09	0.07	0.05	0.04
Pb	8.54	12.73	9.68	9.33	6.40	2.69	7.83	10.88	4.31	1.87	10.11
Bi	0.01	0.02	0.02	0.10	0.09	0.02	0.02	0.05	0.05	0.03	0.02
Th	0.06	0.18	0.21	1.18	0.74	0.15	0.22	0.62	0.62	0.24	0.19
U	2.30	3.13	2.11	8.10	4.83	1.58	1.85	3.06	3.38	1.47	2.26
Ni/Co	5.22	3.52	3.73	8.22	10.42	3.21	4.71	6.52	7.22	5.53	3.69
V/Sc	2.38	4.66	5.26	17.26	16.11	2.11	2.54	12.52	9.49	2.41	1.89
Fe_H	-	-	-	0.168	0.056	0.019	0.072	0.304	0.230	0.020	0.053
Fe_p	-	-	-	0.078	0.026	0.009	0.033	0.142	0.107	0.009	0.025
DOP	-	-	-	0.621	0.393	0.510	0.803	0.862	0.816	0.431	0.749
TOC	0.11	0.08	0.25	0.71	0.66	0.09	0.1	0.41	0.52	0.18	0.18
注：微量元素单位为10^-6；Fe_H是酸溶铁含量，单位为%，Fe_p是黄铁矿铁含量，单位为%；TOC单位为%.

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