Výsledky vyhledávání - "Michel Lamboy"

Genesis of apatite in the phosphatized limestones of the western continental shelf of India

Autor: V. Purnachandra Rao, Michel Lamboy

Publikováno v: Marine Geology. 136:41-53

Phosphatized corals, algal nodules/encrustations and pelletal limestones occur at depths between 60 and 100 m on the western continental shelf of India. Microstructural studies of limestones by SEM indicate that phosphate occurs as (a) brown infillin

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b201803aba7bdc973e9f220660a26c32
https://doi.org/10.1016/s0025-3227(96)00062-x

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Verdine and glaucony facies from surficial sediments of the eastern continental margin of India

Autor: Venigalla Purnachandra Rao, Meloth Thamban, Michel Lamboy

Publikováno v: Marine Geology. 127:105-113

The present paper reports the first mineralogical description of green grains (verdine and glaucony) from sediments of the eastern continental margin of India. Only 24 of the 82 sediment samples studied, at depths between 18 and 247 m, contain green

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d63b888201ef6c3d72cc895ee8f91b4a
https://doi.org/10.1016/0025-3227(95)00056-5

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Late Quaternary Halimeda bioherms and aragonitic faecal pellet-dominated sediments on the carbonate platform of the western continental shelf of India

Autor: M. Veerayya, Michel Lamboy, R.R. Nair, P.A. Dupeuble, V. Purnachandra Rao

Publikováno v: Marine Geology. 121:293-315

The Fifty Fathom Flat is a drowned carbonate platform located on the outer continental shelf of western India. It is unique because the carbonate depositional environment prevailed until Early Holocene in spite of its proximity to a major siliciclast

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6dea57352830352092b11dead788c687
https://doi.org/10.1016/0025-3227(94)90036-1

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Nannostructure and significance of fish coprolites in phosphorites

Autor: Nasreddine Azzouzi, Ezzat A. Ahmed, Venigalla Purnachandra Rao, Michel Lamboy

Publikováno v: Marine Geology. 120:373-383

Phosphatic coprolites (0.5–2 cm long) occurring in Cretaceous-Eocene phosphorites of Tunisia, Morocco, Mauritania, Senegal, and Egypt were investigated for their petrology by using SEM. They exhibit a homogeneous porous apatite structure with a few

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::aa0dfdd9acde3f9f79451cfb5464cf7a
https://doi.org/10.1016/0025-3227(94)90068-x

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Nannostructure and genesis of phosphorites from ODP Leg 112, the Peru margin

Autor: Michel Lamboy

Publikováno v: Marine Geology. 118:5-22

A SEM-based petrographic study of Miocene to Quaternary phosphorites recovered during ODP Leg 112 shows that they contain a variety of apatitic nannostructures. In porous types, apatite appears as ovoid, dumbbell-like, botryoid, micron-sized, and inf

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5b38fca02dd1800d6266279e12007fa8
https://doi.org/10.1016/0025-3227(94)90110-4

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Verdine and other associated authigenic (glaucony, phosphate) facies from the surficial sediments of the southwestern continental margin of India

Autor: Michel Lamboy, P.A. Dupeuble, V. Purnachandra Rao

Publikováno v: Marine Geology. 111:133-158

Green grains, pale green-brown infillings of foraminifer tests and brown friable aggregates occur in the coarse fraction of the surface sediments from the southwestern continental margin of India, between the Periyar river in the north and Quilon in

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c25bf826c409ae1d90ffa6104308f7a3
https://doi.org/10.1016/0025-3227(93)90193-y

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Phosphatization of calcium carbonate in phosphorites: microstructure and importance

Autor: Michel Lamboy

Publikováno v: Sedimentology. 40:53-62

Fabrics of phosphatized calcium carbonate particles in various phosphorites have been studied using scanning electron microscopy coupled with X-ray dispersive microanalysis. Replacement of calcium carbonate by apatite has been observed in bivalve she

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d35b1eb600f879ef9742131e3a3348dc
https://doi.org/10.1111/j.1365-3091.1993.tb01090.x

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Possible microbial origin of phosphorites on Error Seamount, northwestern Arabian Sea

Autor: Michel Lamboy, V. Purnachandra Rao, R Natarajan

Publikováno v: Marine Geology. 106:149-164

Petrographical, mineralogical and microprobe analysis of phosphorites from Error Seamount, in the northwestern Arabian Sea, demonstrates that microbial processes played an important role in the early diagenetic formation of the phosphorites during su

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7b0e2bb7d66bf668d5d166685bf9f277
https://doi.org/10.1016/0025-3227(92)90060-u

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