&nbsp;Geochemical characteristics and sedimentary environment significance of carbonate rocks in Nanfen Formation of Qingbaikou System in Tonghua，Jilin Province

ZHANG Junsheng; JIA Xiaoyu and GONG Hui

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Global Geology ›› 2021, Vol. 24 ›› Issue (2) : 89-94.

Geochemical characteristics and sedimentary environment significance of carbonate rocks in Nanfen Formation of Qingbaikou System in Tonghua，Jilin Province

ZHANG Junsheng，JIA Xiaoyu and GONG Hui

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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．

Key words

Nanfen Formation / carbonate rock / geochemistry / sedimentary environment

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ZHANG Junsheng，JIA Xiaoyu and GONG Hui. Geochemical characteristics and sedimentary environment significance of carbonate rocks in Nanfen Formation of Qingbaikou System in Tonghua，Jilin Province[J]. Global Geology. 2021, 24(2): 89-94