TRIASSIC ARAGONITE IN CARBONATE SOURCE-RO CK FROM RAGUSA BASIN (SICILY) - GEOCHEMISTRY, COMPARISON WITH RECENT SEDIMENTS AND ORIGIN

Authors
LOREAU JP SABBADINI S BROSSE E FRIXA A
Citation
Jp. Loreau et al., TRIASSIC ARAGONITE IN CARBONATE SOURCE-RO CK FROM RAGUSA BASIN (SICILY) - GEOCHEMISTRY, COMPARISON WITH RECENT SEDIMENTS AND ORIGIN, Comptes rendus de l'Academie des sciences. Serie II. Sciences de la terre et des planetes, 321(2), 1995, pp. 111-118
Citations number
23
Categorie Soggetti
Multidisciplinary Sciences
Journal title
Comptes rendus de l'Academie des sciences. Serie II. Sciences de la terre et des planetes → ACNP
ISSN journal
12518050
Volume
321
Issue
2
Year of publication
1995
Pages
111 - 118
Database
ISI
SICI code
1251-8050(1995)321:2<111:TAICSC>2.0.ZU;2-H
Abstract
Aragonitic muds from the upper Trias occur in laminites between two la minae rich in clays and/or organic matter. Two types of aragonite are identified. The first shows rod or needle morphology, with Sr content (9,300 ppm), delta(18)0 (-1.1 to -1.7) and delta(13)C (+2.1 to +2.8) m ostly similar to aragonite of Recent sediments. It is not biodetrital in origin but results from direct precipitation at 22-30 degrees C in sea water with a Sr-m(2+)/Ca-m(2+) ratio very near to Recent values. T he second aragonite showing greater prismatic crystals with inclusions of relics of rods and needles, a high content in strontium (15,800 pp m) and a negative delta(13)C (-13.0 a -14.4), is diagenetic.