首页|Paleoclimatic Controls on Clay Mineral Distribution in the Early Cretaceous(Barremian):The Wessex Basin,Southeast England

Paleoclimatic Controls on Clay Mineral Distribution in the Early Cretaceous(Barremian):The Wessex Basin,Southeast England

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This study describes the clay mineralogy of the Lower Cretaceous(Barremian)rocks of the Wessex Basin for paleoenvironmental interpretations.Seventy-four samples were subjected to opti-cal microscopy,scanning electron microscopy/energy-dispersive X-ray spectroscopy(SEM/EDS),and quantitative evaluation of minerals by scanning electron microscopy(QEMSCAN®)techniques.The re-sults revealed an illite-dominated sedimentation in most sections of the basin,with kaolinite,chlorite,smectite and glauconite occurring in subordinate quantities.Inferred paleoclimatic conditions from the clay mineral trends indicates a warm and dry climate,with seasonal precipitation.Kaolinite to illite ra-tios indicate that more arid climate conditions were prevalent but brief periods of warm and humid conditions were also present.A strong positive correlation between chlorite and tourmaline indicates that excess chlorite may have been contributed from tourmaline-chlorite-schists in a tourmaline-dominated provenance.SEM confirms that most of the clay minerals are detrital in origin but authi-genic kaolinite is also present as vermiform and mica-replacive kaolinite which formed during early diagenetic modification from flushing meteoric waters in warm humid climates.This study is signifi-cant because it demonstrates the importance of multi-proxy methods for understanding clay minerals within sedimentary basins for interpreting the paleoclimatic conditions of depositional systems.

clay mineralskaoliniteLower CretaceousEnglish WealdenQEMSCAN®

Oladapo O.Akinlotan、Ogechukwu A.Moghalu、Stuart J.Hatter、Byami A.Jolly、Okwudiri A.Anyiam

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Faculty of Health,Medicine & Social Care,Anglia Ruskin University,Chelmsford,CM1 1SQ,United Kingdom

Department of Geology,University of Nigeria,Nsukka 410001,Nigeria

Badley Ashton & Associates Ltd.,Winceby,Horncastle,LN9 6PB,Lincolnshire,United Kingdom

Department of Geology,Ahmadu Bello University,Zaria,Nigeria

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2024

10.1007/s12583-023-1917-y

地球科学学刊(英文版)
中国地质大学

地球科学学刊(英文版)

CSTPCD
影响因子：0.724
ISSN：1674-487X
年,卷(期)：2024.35(6)