贵州松桃大塘坡地区南华纪早期冷泉碳酸盐岩地质地球化学特征

周琦; 杜远生; 颜佳新; 张命桥; 尹森林

贵州松桃大塘坡地区南华纪早期冷泉碳酸盐岩地质地球化学特征

周琦^{1, 3,},
杜远生^{1, 2, ,},
颜佳新^{1, 2},
张命桥³,
尹森林³

1.
中国地质大学地球科学学院, 湖北武汉 430074
2.
中国地质大学生物地质与环境地质教育部重点实验室, 湖北武汉 430074
3.
贵州省地矿局103地质大队, 贵州铜仁 554300

基金项目:

中国石油化工股份有限公司海相油气勘探前瞻性项目 G0800-06-ZS-319

国家自然科学基金项目 40621002

教育部创新团队发展计划 RT00546

贵州省科技基金项目 20072160

详细信息

作者简介:
周琦(1964-), 男, 研究员, 博士生, 古生物学与地层学方向.E-mail: 103zq@sohu.com

通讯作者:
杜远生, 男, 教授, 博士生导师, 沉积学方向.E-mail: dxyyz@cug.edu.cn

中图分类号: P588
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出版历程
- 收稿日期: 2007-08-26
- 刊出日期: 2007-11-25

Geological and Geochemical Characteristics of the Cold Seep Carbonates in the Early Nanhua System in Datangpo, Songtao, Guizhou Province

ZHOU Qi^{1, 3
,},
DU Yuan-sheng^{1, 2
, ,},
YAN Jia-xin^{1, 2},
ZHANG Ming-qiao³,
YIN Sen-lin³

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Key Laboratory of Biogeology and Environmental Geology of Ministry of Education, China University of Geosciences, Wuhan 430074, China
3.
Geological Team 103, Guizhou Bureau of Geology and Mineral Resources, Tongren 554300, China

摘要

摘要: 贵州松桃大塘坡地区的南华系是研究古代天然气渗漏及冷泉碳酸盐岩的理想地区之一.该区冷泉碳酸盐岩由两类岩石组成: 一是两界河组含砾砂岩中(Sturtian冰期早期) 的白云岩丘或透镜体; 二是之上的大塘坡组第一段黑色含锰岩系中的似层状或透镜状菱锰矿矿体及少量白云岩透镜体.该地区冷泉碳酸盐岩的碳同位素具明显的负偏特征, 充填在菱锰矿矿石气孔中的沥青碳同位素为-30.98‰, 并具有异常高的硫同位素正值.结合冷泉碳酸盐岩的空间分布、古天然气渗漏构造、菱锰矿的沉积有机质等特征分析, 认为其与现代冷泉碳酸盐岩的特征十分相近.两界河组的白云岩丘是目前所发现的最古老的冷泉碳酸盐岩, 与在它之上的菱锰矿矿体是同一个古天然气渗漏系统中不同时期的冷泉碳酸盐沉积.天然气泄漏形成的冷泉与大塘坡组烃源岩的形成关系密切.
- 贵州 /
- 南华系 /
- 冷泉碳酸盐岩 /
- 地球化学
Abstract: Nanhua System in Datangpo, Songtao County, Guizhou Province is proposed to be one of the ideal areas to investigate the ancient gas seep and the associated cold spring carbonates. The cold seep carbonates found here occur as two kinds of rocks. One is the dolomite hills or lens in the clastic rocks of Liangjiehe Formation, which is thought to be formed during the early Sturtian glacial stage, and thus to be the oldest cold spring carbonates. The other is represented by the rhodochrosite orebodies occurring as layers and lens in association with some dolomite lens in the black manganese-bearing rocks in the first member in Datangpo Formation. The carbon isotope composition of the cold spring carbonates in the area shows a negative anomaly, and the carbon isotope composition of the asphalt filled in the gas holes in rhodochrosite orebodies is measured to be -30.98‰. The negative carbon isotope values are associated with the positive anomaly of the sulfur isotope composition. The cold seep carbonate rocks identified in this region are comparable with modern counterparts in the characteristics and the distribution of the carbonates, the gas seep structures and the depositional organics in the rhodochrosite orebodies. The dolomite hills and the rhodochrosite orebodies are formed in the same ancient gas seep system during different periods, showing a close relationship with the hydrocarbon source rocks of Datangpo Formation.
- Guizhou /
- Nanhua System /
- cold spring carbonates /
- geochemistry

HTML全文

图 1 贵州省松桃县大塘坡地区地质图(a) 和构造背景图(b)

1.留茶坡组(震旦-寒武系); 2.陡山沱组; 3.南沱组; 4.大塘坡组第二段; 5.大塘坡组第一段; 6.铁丝坳组; 7.两界河组; 8.板溪群; 9.地层界线; 10.不整合界线; 11.正断层; 12.逆断层; 13.性质不明断层; 14.向斜轴; 15.地层产状; 16.研究区位置; 17.冷泉碳酸盐岩分布区; 18.采样坑道位置及编号; 19.采样剖面位置

Fig. 1. Geological map of Datangpo area in Songtao County, Guizhou Province (a) and the tectonic background map (b)

下载: 全尺寸图片幻灯片

图 2 大塘坡PD1200中菱锰矿矿体碳氧同位素变化趋势图

1.含炭质含砾砂岩; 2.炭质粘土岩; 3.条带状菱锰矿; 4.块状菱锰矿; 5.气孔状菱锰矿; 6.碳氧同位素值及变化曲线

Fig. 2. The profile showing change trends of the C, O isotope composition of rhodochrosite orebody in Datangpo PD1200

下载: 全尺寸图片幻灯片

图 3 大塘坡猫猫岩剖面两界河组白云岩丘碳氧同位素变化趋势图

1.粉砂质板岩; 2.含砾砂岩; 3.含砾白云质砂岩; 4.帐篷状构造白云岩; 5.层纹状白云岩; 6.碳氧同位素值及变化曲线; 7.地层缩减厚度

Fig. 3. The profile showing change trends of C, O isotopel composition of dolomite hill in Liangjiehe Fm. in Maomaoyan section, Datangpo County

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表 1 大塘坡PD1200坑道菱锰矿碳氧同位素数据

Table 1. Stable C, O isotope data of the rhodochrosite in Datangpo PD1200

表 2 猫猫岩两界河组白云岩丘碳、氧同位素数据

Table 2. Stable C, O isotope data of dolomite hill in Liangjiehe Formation in Maomaoyan section

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