NDLI: Characterization of distal turbidites in marine sedimentary sequences using magnetic mineral data and factor analysis of microfossils assemblages

Content Provider	Springer Nature Link
Author	Pérez Cruz, Ligia Urrutia Fucugauchi, Jaime
Copyright Year	2010
Abstract	Results of a study of turbiditic deposits in a sequence of middle to late Holocene marine sediments from Alfonso Basin in the southern Gulf of California are presented. Turbidites are identified from analyses of core sections, X-ray images, texture and granulometry. Characterization of distal turbidites could be difficult, particularly for thin fine-grained deposits with little contrast in grain size, mineralogy and texture. We have here included analyses of microfossil and magnetic mineral data. Turbiditic currents transport material from various depths in the continental slope into the basin and it can be expected that turbiditic deposits are characterized by re-worked material, lack of microfossils or mixed assemblages with no content of paleoceanographic and paleoclimatic record. This may show in lack of internal coherence as quantified by factor analysis of microfossil assemblages. Turbidites in some cases may also show distinct magnetic properties as compared with those in the sediment sequence. In Alfonso Basin, turbidites show increased contents of detrital magnetic minerals volcanic-derived and transported from the basin slope. We identify twelve turbiditic layers through the sequence that present high magnetic susceptibility and low communalities from factor model to the microfossils data providing characterization of the turbidites.
Starting Page	595
Ending Page	606
Page Count	12
File Format	PDF
ISSN	00393169
Journal	Studia Geophysica et Geodaetica
Volume Number	54
Issue Number	4
e-ISSN	15731626
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-12-09
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	turbidites rock magnetism factor analysis Alfonso Basin Gulf of California Meteorology/Climatology Structural Geology Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics

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