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Variation of lacustrine carbonate deposition in the Eocene Dongying Depression and its comparison with Holocene environments

Published online by Cambridge University Press:  30 March 2022

Jing Wu*
Affiliation:
School of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao266590, China Shandong Province Key Laboratory of Depositional Mineralization & Sedimentary Mineral, Shandong University of Science and Technology, Qingdao, 266590, China
Chao Liang*
Affiliation:
School of Geosciences, China University of Petroleum (East China), Qingdao, 266580, China
Renchao Yang
Affiliation:
School of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao266590, China Shandong Province Key Laboratory of Depositional Mineralization & Sedimentary Mineral, Shandong University of Science and Technology, Qingdao, 266590, China
Jun Xie
Affiliation:
School of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao266590, China Shandong Province Key Laboratory of Depositional Mineralization & Sedimentary Mineral, Shandong University of Science and Technology, Qingdao, 266590, China
*
Author for correspondence: Jing Wu, Email: wujing6524982@163.com; Chao Liang, Email: liangchao0318@163.com
Author for correspondence: Jing Wu, Email: wujing6524982@163.com; Chao Liang, Email: liangchao0318@163.com

Abstract

The sedimentary characteristics and preservation potential of lacustrine carbonates provide fundamental information on climate change. The lacustrine carbonate deposition in the Eocene Dongying Depression was investigated using a combination of mineralogical, petrological and geochemical analyses. Micritic calcite/dolomite, granular calcite, columnar calcite, calcareous shell fragments and reworked detrital calcite were identified. Varying patterns of carbonates (VPC) including lithofacies, geochemical indicators and carbonate distribution were revealed in the Dongying Depression: (i) carbonates hardly precipitate in the nearshore area (average 12 wt %); (ii) carbonate content is high (average 53 wt %) in the shallow lake and (iii) gradually decreases to reach a minimum (average 24 wt %) in the deeper part of the lake. Comparison of VPC in four Holocene lakes (the Qinghai Lake and Barkol Lake in China, Oro Lake in Canada and Montcortès Lake in Spain) with the Dongying Depression suggests that four distinct lake stages were developed, namely the terrigenous clastic/gypsum-rich, carbonate-rich, carbonate-decreasing and carbonate-poor stages. A depositional model of lacustrine carbonates influenced by detrital influx, climate, palaeoproductivity and salinity is developed. This study contributes to the understanding of the genetic mechanisms of lacustrine carbonate deposition to reconstruct environmental changes.

Type
Original Article
Copyright
© The Author(s), 2022. Published by Cambridge University Press

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