Microanalyses géochimiques de mineρaux argileus ce sédiments préleves et Atlantique Nord (forages de DSDP)  [Geochemical analyses of clay minerals from sediment samples and the North Atlantic, DSDP boreholes]

Alternate Title(s): Geochemical analyses of clay minerals from sediment samples and the North Atlantic, DSDP boreholes
Author(s): Debrabrant, P.; Delbert, S.; Lemaguer, D.
Volume Title: Clay Minerals
Source: Clay Minerals, 20(1), p.125-145. Publisher: Mineralogical Society, London, United Kingdom. ISSN: 0009-8558 CODEN: CLMIAF
Note: In French with English summary. 29 refs.; illus. incl. 11 tables, sketch map
Summary: Semi-quantitative microprobe analysis shows the existence of significant chemical variations in simple (two-component) clay mineral assemblages. The method is described, and two applications presented and interpreted in terms of sources and palaeoenvironments. The micro-geochemistry of early Cretaceous illites and chlorites identified at the base of Sites 546 and 547 DSDP (Morocco Margin) changes upwards (decrease in Mg), and appears to be influenced by saline diagenesis, which induced the transformation of detrital clays. Hypermagnesian chlorites occur in the lowermost sediments and possibly correspond with authigenesis in a confined environment. Different smectites found at the basalt-sediment boundary in Sites 105 and 384 DSDP (NW Atlantic) can easily be differentiated using Mg, Na, K, Al, Fe, Ti variation diagrams. They reflect different volcanic sources and differ markedly from common terrigenous smectites.
Year of Publication: 1985
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
Key Words: 06 Petrology, Sedimentary; Areal studies; Atlantic Ocean; Authigenesis; Chemical analysis; Chemical composition; Chlorite; Chlorite group; Clay mineralogy; Cretaceous; DSDP Site 105; DSDP Site 384; DSDP Site 546; DSDP Site 547; Deep Sea Drilling Project; Diagenesis; Experimental studies; IPOD; Illite; Leg 11; Leg 43; Leg 79; Lower Cretaceous; Mesozoic; North Atlantic; Quantitative analysis; Sedimentary petrology; Sheet silicates; Silicates
Coordinates: N300000 N400000 W0100000 W0700000
Record ID: 1985057858
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom