扬子克拉通北缘神农架地区矿石山组Pb-Pb等时线年龄及其地质意义

卢山松; 邱啸飞; 谭娟娟; 吕红; 杨红梅; 王志先; 钟权

doi:10.3799/dqkx.2016.023

扬子克拉通北缘神农架地区矿石山组Pb-Pb等时线年龄及其地质意义

doi: 10.3799/dqkx.2016.023

卢山松^1,2,,
邱啸飞^1,2,
谭娟娟^1,2,
吕红^1,2,
杨红梅^1,2,
王志先³,
钟权³

1.
中国地质调查局武汉地质调查中心，湖北武汉 430205
2.
中国地质调查局花岗岩成岩成矿地质研究中心，湖北武汉 430205
3.
湖北省神农架国家地质公园管理局，湖北木鱼坪 442421

基金项目:

中国地质调查局项目 1212011121102

中国地质调查局项目 Nos.12120114005701

国家自然科学基金青年基金 No.41303026

详细信息

作者简介:
卢山松(1986-)，男，助理研究员，硕士，主要从事同位素地球化学和岩石地球化学研究. E-mail: luyin_student@163.com

中图分类号: P581
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出版历程
- 收稿日期: 2015-08-05
- 刊出日期: 2016-02-15

The Pb-Pb Isochron Age of the Kuangshishan Formation in Shennongjia Area on the Northern Margin of the Yangtze Craton and Its Geological Implications

1.
Wuhan Center of Geological Survey, China Geological Survey, Wuhan 430205, China
2.
Research Center of Granitic Diagenesis and Mineralization, China Geological Survey, Wuhan 430205, China
3.
Hubei Shennongjia National Geopark Administrative Bureau, Muyuping 442421, China

摘要

摘要: 扬子克拉通北缘神农架地区出露了大量中元古代碳酸盐岩地层，但已有的同位素年代学资料有限，故对神农架群矿石山组白云岩开展了全岩Pb-Pb等时线测年.研究结果表明，矿石山组白云岩²⁰⁶Pb/²⁰⁴Pb变化范围相对较大，为18.753~23.106，而²⁰⁷Pb/²⁰⁴Pb和²⁰⁸Pb/²⁰⁴Pb则变化范围相对较小，分别为15.606~16.046和37.793~38.599.八件白云岩样品²⁰⁶Pb/²⁰⁴Pb和²⁰⁷Pb/²⁰⁴Pb之间呈良好的线性关系，构成Pb-Pb等时线年龄为1632±75Ma(MSWD=8.7)，代表了矿石山组地层主体沉积时代，与已有的年代学结果可对应，表明Pb-Pb同位素体系可对古老的碳酸盐岩地层进行较为精确地定年.结合前人对于神农架群的年代学资料，确定神农架群的沉积时限应为1600~1100Ma的中元古代.
- 神农架群 /
- 矿石山组 /
- Pb-Pb等时线 /
- 中元古代 /
- 碳酸盐岩 /
- 岩石学
Abstract: The Shennongjia Group, located on the northern margin of the Yangtze Craton, shows a series of well-preserved succession of the Mesoproterozoic carbonate strata. However, geochronological data collected from this area are limited. In this study, we report a Pb-Pb isochron age for the Kuangshishan Formation of the Shennongjia Group. The ²⁰⁶Pb/²⁰⁴Pb ratios of the dolostone of the Kuangshishan Formation show wide variations from 18.753 to 23.106. On the contrary, the ²⁰⁷Pb/²⁰⁴Pb ratios and the ²⁰⁸Pb/²⁰⁴Pb ratios have a limited range from 15.606 to 16.046 and 37.793 to 38.599, respectively. 8 dolostone samples data show an obvious linear relationship between ²⁰⁶Pb/²⁰⁴Pb and ²⁰⁷Pb/²⁰⁴Pb, yielding a Pb-Pb isochron age of 1632±75Ma (MSWD=8.7) which represent the depositional age for the Kuangshishan Formation. This age accords well with previous published data, indicating that a precise stratigraphic age of the ancient carbonate strata can be obtained through Pb-Pb dating technique. Combined with previous researches, we suggest that the age span of the Shennongjia Group is 1600 to 1100Ma of Mesoproterozoic.
- Shennongjia Group /
- Kuangshishan Formation /
- Pb-Pb isochron /
- Mesoproterozoic /
- carbonate /
- petrology

HTML全文

图 1 神农架地区地质简图

据Qiu et al.(2011) 修改

Fig. 1. Geological sketch of Shennongjia region

下载: 全尺寸图片幻灯片

图 2 神农架地区中元古代地层柱状图及采样点位

1.砾岩；2.砂砾岩；3.砂岩；4.粉砂岩；5.页岩/板岩；6.燧石；7.石灰岩；8.白云岩；9.角砾状白云岩；10.硅质条带白云岩；11.叠层石白云岩；12.火山岩；13.凝灰岩；14.整合接触关系；15.平行不整合接触关系；16.采样点；据李怀坤等(2013) 修改

Fig. 2. Mesoproterozoic stratigraphic histogram of the Shennongjia area and the sampling locations of the Kuangshishan Formation

下载: 全尺寸图片幻灯片

图 3 神农架群矿石山组Pb-Pb等时线

Fig. 3. Pb-Pb isochron of carbonate rocks from the Kuangshishan Formation, Shennongjia Group

下载: 全尺寸图片幻灯片

表 1 神农架群矿石山组Pb同位素组成

Table 1. Pb isotope compositions of carbonate rocks from the Kuangshishan Formation, Shennongjia Group

序号	样号	岩性	²⁰⁶Pb/²⁰⁴Pb	2δ	²⁰⁷Pb/²⁰⁴Pb	2δ	²⁰⁸Pb/²⁰⁴Pb	2δ
1	12SNJ-72	块状白云岩	19.038	0.005	15.641	0.004	38.135	0.006
2	12SNJ-73	含黑色叠层石白云岩	19.774	0.005	15.707	0.004	37.897	0.008
3	12SNJ-75	块状白云岩	18.753	0.002	15.606	0.002	37.793	0.004
4	12SNJ-76	块状白云岩	20.322	0.007	15.740	0.006	38.341	0.009
5	12SNJ-77	含黑色叠层石白云岩	18.433	0.004	15.625	0.004	38.241	0.010
6	12SNJ-78	泥质条带白云岩	23.106	0.003	16.046	0.002	38.100	0.005
7	12SNJ-81	泥质条带白云岩	19.621	0.005	15.711	0.004	38.016	0.007
8	12SNJ-83	含叠层石白云岩	19.786	0.006	15.719	0.008	38.599	0.003
9	12SNJ-84	块状白云岩	21.076	0.005	15.830	0.004	38.114	0.001

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