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Global Geology 2021, 24(2) 89-94 DOI:
ISSN: 1673-9736 CN: 22-1371/P |
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Geochemical characteristics and sedimentary environment significance of carbonate rocks in Nanfen Formation of Qingbaikou System in Tonghua，Jilin Province |
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ZHANG Junsheng，JIA Xiaoyu and GONG Hui |
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1． Science and Technology Park，Jilin University，Changchun 130012，China;
2． College of Earth Sciences，Jilin University，Changchun 130061，China |
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Abstract:
In order to reveal the sedimentary environment of carbonate rocks in Nanfen Formation of Qingbaikou System in Tonghua，Jilin Province，the mineral composition and petrochemistry of carbonate rocks in Nanfen Formation were analyzed． The mineral compositions of five carbonate rock samples in Nanfen Formation mainly consist of calcite，with minor clay minerals and quartz，and the rock type is siliceous marlite． The Mn /Sr values range from 1． 52 to 4． 08，with an average of 2． 64，indicating that the carbonate rocks experienced weak
diagenesis; the Sr /Ba values range from 1． 26 to 2． 51，with an average of 1． 93，indicating marine environment; the ratio of Mg /Al ranges from 35． 33 to 86． 34，with an average of 62． 95，indicating the seawater environment，
which is consistent with the result from Sr /Ba; the MgO/CaO values range from 0． 01 to 0． 04，with an average of 0． 02，indicating humid environment; the values of V/( V + Ni) range from 0． 63 to 0． 73，with an average of 0． 70，indicating anoxic environment． In summary，geochemical analyses show that the Nanfen
Formation carbonate rocks are marine deposits，in a warm，humid，anoxic environment with poor flow of seawater， and subsequently underwent weak diagenetic alteration． |
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Keywords:
Nanfen Formation
carbonate rock
geochemistry
sedimentary environment
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