河南汝州-鲁山一带震旦系东坡组碳酸盐沉积的碳同位素负偏及其地质意义

张良; 杜远生; 左景勋; 周琦

河南汝州-鲁山一带震旦系东坡组碳酸盐沉积的碳同位素负偏及其地质意义

张良^{1, 2,},
杜远生^{1, 3, ,},
左景勋²,
周琦¹

1.
中国地质大学地球科学学院, 湖北武汉 430074
2.
河南省地质调查院, 河南郑州 450001
3.
教育部生物地质与环境地质重点实验室, 湖北武汉 430074

基金项目:

中石化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项目 IRT00546

详细信息

作者简介:
张良(1963-), 男, 教授级高级工程师, 博士生, 主要从事沉积地质与区域地质研究.E-mail: zliang1963@126.com

通讯作者:
杜远生, dxyyz@cug.edu.cn

中图分类号: P588.2
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出版历程
- 收稿日期: 2008-04-12
- 刊出日期: 2008-07-25

Negative Anomaly of Carbon Isotope from Carbonates of Sinian Dongpo Formation in Ruzhou and Lushan, Henan Province and Its Geological Significance

ZHANG Liang^{1, 2
,},
DU Yuan-sheng^{1, 3
, ,},
ZUO Jing-xun²,
ZHOU Qi¹

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Academy of Geological Survey of Henan Province, Zhengzhou 450001, China
3.
Key Laboraratory of Biogeology and Environment Geology of Ministry of Education, Wuhan 430074, China

摘要

摘要: 河南汝州、鲁山一带罗圈组冰积层之上的东坡组以页岩、粉砂质页岩及粉砂岩为主.笔者发现了东坡组夹有白云岩透镜体及白云质粉砂岩、砂岩.白云质粉砂岩具有与东坡组页岩不协调的软沉积变形.白云岩透镜体和白云质粉砂岩具有明显的δ¹³C负偏.白云岩透镜体的δ¹³C为-4.19‰~-6.18‰.白云质粉砂岩的δ¹³C大部分为-2‰~-4‰之间.因此认为, 东坡组的白云岩透镜体及白云质粉砂岩、砂岩与华南震旦纪盖帽白云岩及南华纪Sturtian冰期冰积层之上的碳酸盐丘和菱锰矿类似, 为冰积层中的天然气水合物泄漏释放的CO₂和海水中的Mg²⁺发生快速反应快速沉淀而成的, 即东坡组的白云岩、白云质粉砂岩、砂岩为冷泉成因.
- 冷泉碳酸盐岩 /
- 碳同位素 /
- 震旦纪 /
- 河南省
Abstract: Sinian Dongpo Formation overlying tillite of Luoquan Formation consists mainly of shales, silty shales and siltstones.Lenticular dolomites, dolomitic siltstones and sandstones are unexpectedly found in Dongpo Formation.Soft-sediment reformation occurs in dolomitic siltstones which are inconsistent with the shales of Dongpo Formation.Negative anomaly of δ¹³C is found in lenticular dolomites and dolomitic siltstones.δ¹³C of lenticular dolomites is-4.19‰ to-6.18‰ and δ¹³C of dolomitic siltstones mostly between-2‰ to-4‰.So it is considered that lenticular dolomites, dolomitic siltstones and sandstones in Dongpo Formation, similar to cap dolomite of Sinian and seep carbonates overlying tillite of Sturtian ice-age in South China, have been formed by interaction between CO₂ seeped from gas hydrate and Mg²⁺ in sea water, that is, lenticular dolomites, dolomitic siltstones and sandstones in Dongpo Formation are the cause of formation of cold spring.
- cold seep carbonate /
- carbon isotope /
- Sinian /
- Henan Province

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图 1 研究区交通位置图

1.汝州市阳坡剖面; 2.汝州市罗圈剖面; 3.鲁山县九女洞剖面

Fig. 1. Traffic map of the study area

下载: 全尺寸图片幻灯片

图 2 汝州-鲁山一带东坡组白云质粉砂岩和白云岩透镜体照片

a.汝州阳坡东坡组白云质粉砂岩; b, c.汝州罗圈东坡组白云质粉砂岩的软沉积变形; d.汝州罗圈东坡组白云岩透镜体; e.鲁山九女洞东坡组变形的粉砂质、泥质白云岩; f.鲁山九女洞东坡组白云岩透镜体

Fig. 2. The photos of the dolomite and dolomitic siltstone from Dongpo Formation in Ruzhou and Lushan

下载: 全尺寸图片幻灯片

表 1 汝州-鲁山东坡组白云岩和白云质粉砂岩的碳、氧同位素含量

Table 1. Contents of C, O isotopes of dolomite and dolomitic siltstone from Dongpo Formation in Ruzhou and Lushan

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