Results 91 to 100 of about 23,092 (234)
Journal of Petroleum Geology, EarlyView.ABSTRACT The diagenetic albitization of plagioclase and K‐feldspar grains is a transformative process that significantly alters sandstone's detrital composition and formation water chemistry, impacting reservoir quality. In this study, Eocene turbidite sandstones from the offshore Espírito Santo Basin, Brazil, were investigated to elucidate the role of
Eveline E. Zambonato +2 more
wiley +1 more source
Terra Nova, EarlyView.ABSTRACT Thin, discontinuous, organic‐rich oil shale beds in the siliciclastic‐evaporitic Salt Range Formation (SRF) of Pakistan are of approximate Neoproterozoic to Cambrian age based on stratigraphic constraints. The beds are enriched (26–43 wt.% total organic carbon, TOC) in aliphatic organic matter (OM) of low thermal maturity despite their ...
Paul C. Hackley +4 more
wiley +1 more source
Petrographic relations between muscovite-biotite granite and hornblende-biotite granite.
The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists, 1985 The relationship between muscovite-biotite granite and hornblende-biotite granite was investigated. Chemical analyses satisfying the following three conditions collected from the literature were used to compare the two types of granite; 1) The chemical analysis was of a rock called “granite” by the original author.
openaire +2 more sources
U–Pb Dating of Cambrian Magmatism in the Pinerolo‐Sanfront Unit, Dora‐Maira Massif (Western Alps)
Terra Nova, EarlyView.ABSTRACT The Pinerolo‐Sanfront Unit (PSU), the structurally lowest tectonic unit of the Dora‐Maira Massif (Western Alps), has been regarded as a monocyclic unit composed of Permo‐Carboniferous sediments and Permian granitoids that were metamorphosed during the Alpine orogeny.
Francesco De Cesari +6 more
wiley +1 more source
Geology, alteration, mineralization and geochemistry at south of Arghash (Neyshabour)
Journal of Economic Geology, 2011 The Arghash area is located 45 km to southwest of Neyshabour. The subvolcanic rocks in the area consist of biotite hornblende quartz monzodiorite porphyry, hornblende biotite quartz monzodiorite porphyry, hornblende monzonite porphyry, biotite hornblende
Zahra Karimi Saeidabadi +2 more
doaj +1 more source
Terra Nova, EarlyView.ABSTRACT The Southern Brasília Orogen formed during Western Gondwana's final assembly and comprises nappe systems piled against the São Francisco Craton. We present new rutile U–Pb ages from the lowermost Canastra Group (> 2.2 Ga) and the uppermost Carrancas Group (~560 Ma), integrated with published zircon, monazite, garnet, and mica ages from the ...
Rodrigo Irineu Cerri +7 more
wiley +1 more source
Leaching of fluoride from biotite mica in soil : implications for fluoride in shallow groundwater [PDF]
, 2012 Leaching of F− from biotite was investigated at room temperature by performing a series of short-term leach tests. The leaching of F− from biotite structure strongly depends on its weathering stage.
Kularatne, Kanchana +1 more
core +1 more source
Geochemistry of biotite from Kuala Lumpur Granite
, 2002 This work presents a new biotite analyses of Kuala Lumpur granite. The biotites have been analysed from three different samples namely equigranular normal biotite-muscovite granite (NBMG), deformed muscovite granite (DBMG) and porphyritic biotite ...
A. Ghani, Azman
core
On the association of orthopyroxene-garnet-biotite found in the Lutzow-Holmbukta region, East Antarctica [PDF]
, 1982 P(論文)Acid to intermediate metamorphites with the stable association of orthopyroxene, garnet and biotite are sporadically found in the Langhovde and Skarvsnes areas, Lutzow-Holmbukta.
Suzuki, Morihisa
core +1 more source
Antarctic Record, 1979 The authors, members of the summer party of the 19th Japanese Antarctic Research Expedition, 1977-1978 (JARE-19), surveyed the geology of thc following three areas : Cape Ryugu, Oku-iwa Rock and Telen in East Antarctica.
Yutaka NAKAI +2 more
doaj +1 more source