库车盆地中新生代构造演化: 磷灰石裂变径迹证据

罗梦; 朱文斌; 郑碧海; 朱晓青

doi:10.3799/dqkx.2012.098

库车盆地中新生代构造演化: 磷灰石裂变径迹证据

doi: 10.3799/dqkx.2012.098

南京大学内生金属矿床成矿机制研究国家重点实验, 南京大学地球科学系, 江苏南京 210093

基金项目:

国家自然科学基金项目 40972133

国家科技重大专项 2011zx05035-005-001hz

详细信息

作者简介:
罗梦(1987-), 女, 硕士在读, 从事低温热年代学研究.E-mail: luomeng_08@126.com

中图分类号: P546
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- 文章访问数: 222
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- PDF下载量: 14
- 被引次数: 0
出版历程
- 收稿日期: 2012-05-19
- 网络出版日期: 2021-11-10
- 刊出日期: 2012-09-15

Mesozoic-Cenozoic Tectonic Evolution of the Kuqa Basin: Evidence from Apatite Fission-Track Data

State Key Laboratory for Mineral Deposit Research, Department of Earth Science, Nanjing University, Nanjing 210093, China

摘要

摘要: 通过对库车河剖面14个样品磷灰石裂变径迹的测试, 研究了库车盆地及其源区的构造演化.根据表观年龄和地层年龄关系, 将结果分成8个退火样品和6个碎屑样品.退火样品年龄从北向南从136~93.7 Ma, 记录了构造发育自造山带向盆地扩展的运动样式.其中09dk-6, 09dk-7, 09dk-8和09dk-11未通过X²检验, 分析认为与后期构造活动有关, 分解得到最年轻的年龄组记录了库如力向斜, 捷斯德里克背斜和阿合断层分别在74.4 Ma、24.2 Ma和50.8 Ma的最新一期活动.碎屑磷灰石得到了250 Ma、160 Ma和100 Ma3个明显的静态峰.结合热模拟研究表明, 研究区存在250 Ma、160 Ma、100 Ma和20 Ma四期构造隆升, 是对亚洲南缘多期地体碰撞增生的响应.
- 库车盆地 /
- 磷灰石 /
- 裂变径迹 /
- 剥露 /
- 构造演化
Abstract: Fourteen samples were collected from the Kuqa River section for apatite fission track analysis in order to investigate the thermal history of the Kuqa Basin and its sedimentary provenance. By comparing the apparent ages of samples with the related strata ages, the samples can be divided into two groups: the annealed group and the detrital group (unreset samples).The AFT ages become younger from 136 Ma to 93.7 Ma from the Tianshan Mountain to the Kuqa Basin, probably recording a basin-ward propagation of the thrust-fold belt. Samples 09dk-6, 09dk-7, 09dk-8 and 09dk-11 failed the X² test likely due to the subsequent tectonic deformation. The youngest ages extracted from these samples probably record the latest activities of the Kuruli Syncline, Jiesidelike Anticline and the A'ge Fault at 74.4 Ma, 24.2 Ma and 50.8 Ma, respectively. The detrital samples have three peak ages at 250 Ma, 160 Ma and 100 Ma respectively. Thermal history modeling reveals four periods of denudation at 250 Ma, 160 Ma, 100 Ma and 20 Ma in the Kuqa basin and the Tianshan Mountains. The multi-stage denudation is linked to far-field effects resulted from the collision and accretion of terranes along the southern Asian continental margin.
- the Kuqa basin /
- apatite /
- fission track /
- exhumation /
- tectonic evolution

HTML全文

图 1 库车再生前陆盆地前陆变形带构造单元(据卢华复等，1999修改)

构造带：Ⅰ.北部单斜带；Ⅱ.斯的克背斜带；Ⅲ.克-依构造带；Ⅳ.拜城-阳霞凹陷带；Ⅴ.秋里塔格构造带

Fig. 1. Structures in the deformation belt of the Kuqa rejuvenation foreland basin

下载: 全尺寸图片幻灯片

图 2 库车河地质构造略图(a)和A-A'剖面图(b)

Q₁x.西域组；(N₂-Q₁)k.库车组；N₂k.库车组；N₁k.康村组；N₁j.吉迪克组；E_2-3s.苏维依组；E_1-2km.库姆格列木组；K₁bs.巴什基奇克组；K₁b.巴西盖组；K₁s.舒善河组；K₁y.亚格列木组；J₂q.恰克马克组；J₂k.克孜勒努尔组；J₁y.阳霞组；J₁a.阿合组；T₃t.塔里奇克组；T₃h.黄山街组；T₂kl.塔里奇克组；T₁e.俄霍布拉克组；P₁x.小铁里干克群；P₃by.比尤勒包谷孜组；09dk-1~ 09dk-27示采样位置

Fig. 2. Geological map of the Kuqa River area (a) and A-A' cross-section (b)

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图 3 样品的单颗粒年龄雷达图(a)和径迹长度分布(b)

a图左侧纵坐标为标准差，右侧纵坐标为年龄(Ma)

Fig. 3. Single-grain age distribution (a) and track length histograms (b)

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图 4 样品09dk-6(a)、09dk-8(b)和09dk-11(c)的Dpar值分布

Fig. 4. Dpar values of samples 09dk-6 (a), 09dk-8 (b) and 09dk-11 (c)

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图 5 碎屑磷灰石样品年龄峰

Fig. 5. Peaks of the detrital apatite samples

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图 6 样品09dk-1、09dk-2、09dk-6、09dk-8和09dk-11的热史模拟

浅灰色区代表“可以接受的”热史拟合曲线集; 深灰色区为“高质量的”热史曲线集; 黑色曲线代表“最佳”热史拟合曲线(Ketcham, 2005)

Fig. 6. Thermal modelling history of samples 09dk-1, 09dk-2, 09dk-6, 09dk-8 and 09dk-11

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表 1 库车河剖面样品裂变径迹数据

Table 1. Apatite fission track data of the Kuqa River section

	样号	层位	N	ρ_s (10⁵ cm^-2)	N_s	ρ_i (10⁵ cm^-2)	N_i	ρ_d (10⁵ cm^-2)	N_d	P(X²)(%)	t(Ma)	N_t	L(μm)
A	09dk-1	γ₄	29	8.91	1 647	14.20	1 647	11.5	2 862	74.92	126.2±4.7	11	10.873±1.58
	09dk-2	P₁x	27	10.02	1 213	16.37	1 982	11.4	2 840	17.59	128.1±7.6	46	10.789±1.78
	09dk-6	T₃t	30	8.23	1 049	13.42	1 711	11.3	2 818	0.00	121.5±8.3	17	11.35±2.049
	09dk-7	T₃h	31	4.42	925	18.00	3 770	11.2	2 796	0.00	49.7±3.1
	09dk-8	J₁a	30	6.42	738	14.06	1 615	11.1	2 774	0.00	92.0±6.8	11	12.036±1.58
	09dk-11	J₁y	30	5.79	762	17.63	2 320	11.0	2 753	0.06	62.7±4.2	8	11.21±1.84
	09dk-12	J₂q	11	5.80	342	11.59	684	10.9	2 731	56.62	109.1±11.7
	09dk-27	K₁b	9	5.39	216	13.39	537	12.3	3 065	5.58	88.8±10.1
B	09dk-14	K₁y	30	11.51	1 664	13.47	1 947	12.7	3 187	0.01	196.3±11.3
	09dk-15	Q₁x	32	6.67	1 228	29.25	5 384	12.7	3 170	0.00	51.8±3.9
	09dk-21	N₁k	30	7.39	1 252	15.65	2 650	12.5	3 135	0.61	104.3±5.2
	09dk-22	Q₁x	30	7.39	836	16.79	1 899	12.5	3 117	0.00	102.0±7.8
	09dk-23	E_2-3s	30	8.35	1 123	11.84	1 593	12.4	3 100	3.32	154.5±8.4
	09dk-25	E_2-3s	30	16.86	2 045	26.29	3 189	12.3	3 082	0.00	140.9±8.5
注：N=样品颗粒数；N_d=铀标准玻璃对应外探测器的诱发径迹条数；N_s=自发径迹条数；N_i =诱发径迹条数；P(X²)为卡方检测的结果；N_t=所测量的围限径迹长度数；ρ_s.自发径迹密度；ρ_i.诱发径迹密度；ρ_d.铀标准玻璃的诱发径迹密度；L=所测量的围限径迹长度.

下载: 导出CSV

表 2 砂岩屑样品二项式拟合年龄峰值统计结果

Table 2. Binomial analysis results of detrital samples

样品	层位	颗粒数	P(F)	最佳拟合峰(Ma)及所占比例
样品	层位	颗粒数	P(F)	P₀	P₁	P₂
09dk-15	Q₁x	32	0.01	35.3(46.6%)	58.4(33.3%)	86.1(20.4%)
09dk-22	Q₁x	30	0.02	71.8(30.7%)	107.9(65.9%)	445.2(3.4%)
09dk-21	N₁k	30	0.00	101.2(95.8%)	250.1(0.34%)
09dk-25	E_2-3s	30	0.02	111.7(46.5%)	163.9(47.0%)	256(6.6%)
09dk-23	E_2-3s	30	0.00	145.5(88.8%)	234.7(11.2%)
09dk-14	K₁y	30	0.02	152.5(32.1%)	216.4(64.6%)	785(3.3%)

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