GEOCHEMISTRY AND CLAY MINERALOGY OF SHALES IN THE SULU OROGENIC BELT, EAST CHINA: SUGGESTION FOR CONTINENTAL WEATHERING DURING AN EARLY CRETACEOUS HYPERTHERMAL INTERVAL

doi:10.2110/jsr.2023.062

NIGPAS OpenIR

	GEOCHEMISTRY AND CLAY MINERALOGY OF SHALES IN THE SULU OROGENIC BELT, EAST CHINA: SUGGESTION FOR CONTINENTAL WEATHERING DURING AN EARLY CRETACEOUS HYPERTHERMAL INTERVAL
通讯作者	Zhang, Xiangyu([email protected])
	Wang, Hailong 1; Wang, Wenxia 2,3; Cao, Peijing 4; Qin, Min 2,5; Shao, Yiqi 2; Li, Shoujun 6,7; Miao, Chunhui 8; Zhang, Xiangyu 2,5
	2024-08-01
发表期刊	JOURNAL OF SEDIMENTARY RESEARCH
ISSN	1527-1404
卷号	94 期号:4 页码:448-466
摘要	Understanding past weathering-climate feedback mechanisms under greenhouse conditions has significance for guiding the development of climate mitigation strategies. The continental paleoweathering state of Early Cretaceous shales in the Sulu Orogenic Belt of East China during a hyperthermal interval related to oceanic anoxic event 1a (OAE1a) was investigated via geochemical and clay mineralogical analyses of shale samples. The resulting diagrams of ternary 15Al(2)O(3)-Zr-300TiO(2) discrimination, Th/Sc and Zr/Sc show that the geochemical composition was mainly controlled by source composition. This is supported by observations of low Zr contents, high indexes of compositional variability (ICV; > 1), and micropetrological characteristics. All samples showed narrow SiO2/Al2O3 and (Fe2O3 + MgO)/Al2O3 ranges that were within the predicted weathering trends of the ternary A-CN-K diagram, indicating that the shale geochemistry was not influenced by silicification and K-metasomatism. The chondrite-normalized rare-earth- element pattern suggests that all samples had the same felsic igneous parent rock. The geochemistry of whole rocks and their silicate fractions indicates that the shale had low chemical indexes of alteration (CIA) but high ICV values compared to post-Archean Australian Shale, indicating low sediment maturity and extremely weak chemical weathering in the source terrane and/or sedimentary basin under hot-dry conditions. Moreover, the clay minerals in the shale were mainly illite, suggesting low mineral weathering. Thus, during the OAE1a-related hyperthermal interval, chemical weathering was relatively weak in some mid-latitude arid inland areas. This may be mainly due to aridification decreasing water-rock reactions. Chemostratigraphic analysis suggests that the CIA, Ga/Rb, and Rb/Sr values of shales from the upper strata of the Yangjiazhuang and Shuinan formations were greater than those from lower strata. Moreover, the opposite trend in K2O/Al2O3 ratios was found. These indices suggest gradual increases in chemical weathering as the climate changed from hot-dry to warm-humid. In contrast, proxy indices of shale from the Zhifengzhuang Formation showed the opposite trend, suggesting a gradual decrease in chemical weathering as the climate changed from warm-humid to hot-dry. Considering the composition of the clay minerals, it is speculated that continental weathering was dependent on atmospheric humidity rather than temperature under the extreme greenhouse conditions, resulting in ineffective climate regulation by chemical weathering. This comprehensive study advances our understanding of the weathering-climate feedback mechanism under greenhouse regimes.
DOI	10.2110/jsr.2023.062
收录类别	SCI
语种	英语
关键词[WOS]	OCEANIC ANOXIC EVENT ; SEA-SURFACE TEMPERATURES ; SEDIMENTARY-ROCKS ; JIAOLAI BASIN ; MAJOR-ELEMENT ; PROVENANCE ; EVOLUTION ; CLIMATE ; NORTH ; AGE
资助项目	Shandong Provincial Natural Science Foundation of China[42302007] ; Youth Innovation Team Plan of Colleges and Universities in Shandong Province[ZR2022QD085] ; China Postdoctoral Science Foundation[2022KJ112] ; Key Laboratory of Stratigraphy and Palaeontology, Ministry of Natural Resources[2022M711969] ; [KLSP190102] ; [KLSP2102]
WOS研究方向	Geology
WOS类目	Geology
WOS记录号	WOS:001293022900006
项目资助者	Shandong Provincial Natural Science Foundation of China ; Youth Innovation Team Plan of Colleges and Universities in Shandong Province ; China Postdoctoral Science Foundation ; Key Laboratory of Stratigraphy and Palaeontology, Ministry of Natural Resources
出版者	SEPM-SOC SEDIMENTARY GEOLOGY
文献类型	期刊论文
条目标识符	http://ir.nigpas.ac.cn/handle/332004/44166
专题	中国科学院南京地质古生物研究所
通讯作者	Zhang, Xiangyu
作者单位	1.Linyi Univ, Sch Civil Engn & Architecture, Linyi 276000, Shandong, Peoples R China 2.Linyi Univ, Coll Life Sci, Linyi 276000, Shandong, Peoples R China 3.Chinese Acad Sci, State Key Lab Lake Sci & Environm, Nanjing Inst Geog & Limnol, Nanjing 210008, Peoples R China 4.Weifang Land Coordinat & Reserve Ctr, Weifang 261000, Shandong, Peoples R China 5.Minist Nat Resources, Key Lab Stratig & Palaeontol, Beijing 100037, Peoples R China 6.Shandong Univ Sci & Technol, Coll Earth Sci & Engn, Qingdao 266590, Shandong, Peoples R China 7.Chinese Acad Sci, Nanjing Inst Geol & Paleontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Jiangsu, Peoples R China 8.Caoxian Bur Nat Resources & Planning, Heze 274400, Shandong, Peoples R China
推荐引用方式 GB/T 7714	Wang, Hailong,Wang, Wenxia,Cao, Peijing,et al. GEOCHEMISTRY AND CLAY MINERALOGY OF SHALES IN THE SULU OROGENIC BELT, EAST CHINA: SUGGESTION FOR CONTINENTAL WEATHERING DURING AN EARLY CRETACEOUS HYPERTHERMAL INTERVAL[J]. JOURNAL OF SEDIMENTARY RESEARCH,2024,94(4):448-466.
APA	Wang, Hailong.,Wang, Wenxia.,Cao, Peijing.,Qin, Min.,Shao, Yiqi.,...&Zhang, Xiangyu.(2024).GEOCHEMISTRY AND CLAY MINERALOGY OF SHALES IN THE SULU OROGENIC BELT, EAST CHINA: SUGGESTION FOR CONTINENTAL WEATHERING DURING AN EARLY CRETACEOUS HYPERTHERMAL INTERVAL.JOURNAL OF SEDIMENTARY RESEARCH,94(4),448-466.
MLA	Wang, Hailong,et al."GEOCHEMISTRY AND CLAY MINERALOGY OF SHALES IN THE SULU OROGENIC BELT, EAST CHINA: SUGGESTION FOR CONTINENTAL WEATHERING DURING AN EARLY CRETACEOUS HYPERTHERMAL INTERVAL".JOURNAL OF SEDIMENTARY RESEARCH 94.4(2024):448-466.