湘黔地区早寒武世黑色页岩有机碳同位素组成变化及其意义
COMPOSITION OF ORGANIC CARBON ISOTOPE OF EARLY CAMBRIAN BLACK SHALE IN THE XIANG-QIAN AREA AND ITS SIGNIFICANCES
查看参考文献17篇
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文摘
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对扬子地台湘黔地区早寒武世黑色页岩有机碳同位素的组成变化进行野外地质观察与室内分析研究表明：研究区灯影组白云岩主要为碳酸盐台地沉积环境，牛蹄塘组黑色页岩主要为陆棚沉积环境，湖南地区有可能水体更深，过渡到斜坡相沉积区。通过分析，湘黔地区黑色页岩有机碳含量（TOC）为0．05％～12．31％，平均为4．97％。有机碳同位素（δ^13Corg）组成的变化幅度很大，从-29．49‰～-334．41‰（PDB），平均为31．78‰，最大偏移量为4．3‰。牛蹄塘组黑色页岩的δ^13Corg和TOC含量变化也很大，具有明显的3个升降旋回，代表海平面具有海进海退变化特征。而下伏地层灯影组白云岩δ^13Corg值相对比较高，代表海平面下降。研究区两个典型剖面的有机碳同位素变化曲线反映了该期海平面变化，海洋原始生产率以及上涌洋流的变化情况，揭示湘黔地区早寒武世的古海洋信息。 |
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其他语种文摘
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This paper mainly demenstrated the composition of organic carbon isotope of Early Cambrian black shales from the ＂Xiang-Qian＂ area, Yangtze Platform. Detailed study showed that the Dengying Formation dolomites of Late Sinian were deposited in carbonate platform environ ment, whereas the Niutitang Formation black shales of Early Cambrian in continental shelf facies. In Ganziping area, Hunan Province, the water may be deeper than that in Songlin area, Guizhou, and perhaps it was transited into slope facies. Organic carbon contents （TOC/%） rang from 0.05% to 12.31% with an average of about 4. 97%. The organic carbon isotopic values （δ^13Corg） fluctuate sharply from -29.49‰ to --34.41‰ PDB with a mean value of -31.78‰ PDB,showing a negative excursion close to 4. 3‰. In Niutitang Formation black shales, the changes of δ^13Corg values and TOC contents are more obvious than those in Dengying Formation dolomites of Late Sinian. They show three remarkable fluctuation in the whole profiles, which indicates that the sea-level changes were in the transgression or regression. In Late Sinian, the δ^13Corg values of the dolomites are slightly higher than those in Early Cambrian black shales,show ing the desecent of sea level. The carbon isotope curves exhibit the changes of sea level, primary productivity and rise oceanic currents, therefore, this study provides some significant information about Early Cambrian palaeocean in south China. |
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来源
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矿物岩石
,2006,26(1):81-85 【核心库】
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关键词
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早寒武世
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黑色页岩
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有机碳同住素
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古海洋
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湘黔地区
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地址
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中国科学院地球化学研究所, 矿床地球化学重点实验室, 贵州, 贵阳, 550002
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-6872 |
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学科
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地质学 |
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基金
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中国科学院“百人计划”项目
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文献收藏号
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CSCD:2312706
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参考文献 共
17
共1页
|
|
1.
Clarke J M. Naples fauna in western New York.
New York State Mus Men,1904,6:454
|
CSCD被引
1
次
|
|
|
|
|
2.
刘宝王君. 中国南方古大陆沉积地壳演化与成矿[M].
中国南方古大陆沉积地壳演化与成矿,1993:1-231
|
CSCD被引
1
次
|
|
|
|
|
3.
姜月华. 华南下古生界缺氧事件与黑色页岩及有关矿产[J].
有色金属矿产与勘查,1994,3(5):272-278
|
CSCD被引
28
次
|
|
|
|
|
4.
李有禹. 湖南大庸慈利一带下寒武统黑色页岩中海底喷流沉积硅岩的地质特征.
岩石学报,1997,13(1):121-126
|
CSCD被引
23
次
|
|
|
|
|
5.
吴朝东. 湘西黑色页岩多种形态硫的分离与同位素指示意义.
科学通报,1999,44(6):661-665
|
CSCD被引
6
次
|
|
|
|
|
6.
Goldberg T. an isotopic investigation of sedimentary rocks from the Yangtze platform[J].
Progress in Natural Science,2003,13(12):946-950
|
CSCD被引
3
次
|
|
|
|
|
7.
许靖华. 是华南造山带而不是华南地台[J].
中国科学B辑,1987,10:1107-1115
|
CSCD被引
196
次
|
|
|
|
|
8.
任纪舜. 论中国南部的大地构造.
地质学报,1990,64(4):275-288
|
CSCD被引
129
次
|
|
|
|
|
9.
姜月华. 中国南方寒武-奥陶纪大陆斜坡的特征、演化和有关矿产[J].
火山地质与矿产,1993,14(3):29-45
|
CSCD被引
3
次
|
|
|
|
|
10.
Strauss H. Concentrations of organic carbon and maturities and elemental compositions of kerogens.
The Proterozoic Biosphere,1992:95-100
|
CSCD被引
3
次
|
|
|
|
|
11.
Hayes J M. An isotopic study of biogeochemical relationships between carbonates and organic carbon in the Greenhorn Formation[J].
Geochim Cosmochim Acta,1989,53:2961-2972
|
CSCD被引
9
次
|
|
|
|
|
12.
蒲心纯. 中国南方寒武纪岩相古地理与成矿作用[M].
中国南方寒武纪岩相古地理与成矿作用,1993:1-174
|
CSCD被引
25
次
|
|
|
|
|
13.
Kump L R. alternative modeling approaches to the geochemical cycles of carbon.
Amercian Journal of Science,1989,289:390-410
|
CSCD被引
5
次
|
|
|
|
|
14.
Kump L R. Stranglove oceans[J].
Geology,1991,19:299-302
|
CSCD被引
35
次
|
|
|
|
|
15.
李任伟. 震旦纪和早寒武世黑色页岩有机碳同位素组成[J].
中国科学(D辑),1999,29(4):122-128
|
CSCD被引
1
次
|
|
|
|
|
16.
Shen Y. implications for the placement of the Precambrian-Cambrian boundary on the Yangtze platform and global correlations[J].
Geology,2002,28:623-626
|
CSCD被引
1
次
|
|
|
|
|
17.
Shen Y. Biogeochemical approach to understanding phosphogenic events of the terminal Proterozoic to Cambrian[J].
Paleogeogr Paleoclimatal Paleocol,2000,158:99-108
|
CSCD被引
13
次
|
|
|
|
|
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