Topic
Petrography
About: Petrography is a research topic. Over the lifetime, 7449 publications have been published within this topic receiving 102018 citations.
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TL;DR: In this article, the authors investigated the depositional environment of Seam I in the Megalopolis Basin, Southern Greece, using existing geological data supported by maceral and mineralogical analyses, as well as by natural radioactivity determinations.
73 citations
TL;DR: In this article, material signatures of silicified plant stems were obtained from X-ray diffraction analysis, hot cathodoluminescence (CL) imaging and spectroscopy.
72 citations
TL;DR: Abu Hamamid (AH) Neoproterozoic (Sm/Nd model age of 770 ± 20 Ma) mafic-ultramafic intrusion lies along a NE-SW fracture zone in the Shadli Metavolcanic Belt, south Eastern Desert, Egypt as discussed by the authors.
72 citations
TL;DR: In this article, the major and trace element contents of apatite and whole rock in 14 nelsonite-oxide-rich rocks from the Sept-Iles Intrusive Suite (Canada) were studied.
72 citations
01 Jan 2007
TL;DR: In this paper, the chemistry, petrography, and genesis of eruptive rocks from Sites 214 and 216 on the Ninetyeast Ridge and from Site 215 from the central Indian Ocean basin are discussed.
Abstract: Aspects of the chemistry, petrography, and genesis of eruptive rocks from Sites 214 and 216 on the Ninetyeast Ridge and from Site 215 from the central Indian Ocean basin are discussed. In conjunction with the major element data (Hekinian, Chapter 17) we present additional data for the trace elements B, Ba, Co, Cr, Cu, Ga, Li, Mo, Ni, Se, Sr, U, V, Y, Zr and the lanthanide elements (REE). Petrographic study of the samples confirms the details outlined by Hekinian. Features which are believed to be especially relevant to the interpretation of the geochemical data and to the understanding the origin of the Ninetyeast Ridge are emphasized in this chapter. Observations and interpretations of the chemical data lead to the suggestion that the volcanic rocks of Sites 214 and 216 on the Ninetyeast Ridge differ in composition, texture, and mineral paragenesis from typical mid-ocean ridge basalts. The petrography and chemistry are consistent with the hypothesis that the Ninetyeast Ridge samples are fractionated lavas which have cooled and crystallized in shallow magma chambers before extrusion. The basalts from Site 215 in the Central Indian Ocean Basin show textures and mineral paragenesis characteristic of deep-sea pillow basalts. However, they are generally more alkaline in character than either the Ninetyeast Ridge basalts or those from the mid-Indian Ocean Ridge.
72 citations