STERANE AND TRITERPANE BIOMARKERS IN THE PRECAMBRIAN NONESUCH FORMATION, NORTH-AMERICAN MIDCONTINENT RIFT

被引：67

作者：

PRATT, LM ^{[1
]}

SUMMONS, RE ^{[1
]}

HIESHIMA, GB ^{[1
]}

机构：

[1] BUR MINERAL RESOURCES,CANBERRA 2601,AUSTRALIA

来源：

GEOCHIMICA ET COSMOCHIMICA ACTA | 1991年 / 55卷 / 03期

关键词：

D O I：

10.1016/0016-7037(91)90351-5

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Molecular fossils and organic matter from microbial communities living around 1.1 Ga ago are well preserved in the Nonesuch Formation of the US Midcontinent Rift System. Although some compound classes of biological markers have been recognized repeatedly in previous studies of Nonesuch rocks and associated petroleums, steranes and triterpanes have not been detected. Failure to detect these compounds was due primarily to instrumental limitations and the relatively high thermal maturity of samples collected within zones of copper mineralization. Our analyses of Nonesuch samples from the White Pine Mine and nonmineralized localities in Michigan and Wisconsin reveal suites of C26-C30 steranes and C27-C35 pentacyclic triterpanes similar to those found in Phanerozoic oils and sedimentary rocks of marine origin. Stereoisomeric distributions in the Nonesuch samples are consistent with moderate thermal maturity except in the mineralized zone near White Pine.

引用

页码：911 / 916

页数：6

共 17 条

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