Results 61 to 70 of about 729 (236)
Essentials of Igneous and Metamorphic Petrology [PDF]
American Mineralogist, 2015 B. Ronald Frost and Carol D. Frost (2013) Cambridge University Press, U.K. ISBN: 9781107696297, 314 pages. Essentials of Igneous and Metamorphic Petrology , which is easy to recommend, is presented in a concise and compelling manner. The book is about 300 pages and is subdivided into eighteen chapters that convey the fundamental principles that govern
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Terra Nova, EarlyView.ABSTRACT The Paleoproterozoic Talvivaara mudstone is a very large sulfidic Ni‐Co deposit that records enhanced organic matter accumulation during the global Shunga Event. Here, rock geochemistry and microscale S and Fe isotope composition of in situ pyrrhotites and pyrites are studied in well‐characterised, well‐preserved drill core samples.
Raimo Lahtinen +3 more
wiley +1 more source
Petrology of Oligocene Ghaleh Yaghmesh granitoids in the west of Yazd province
Journal of Economic Geology, 2017 Introduction The generation and evolution of granitic magmas has been a hot debated subject among petrologists. The diversity of their origin has led different authors to propose that these rocks are not simple in their origin and might be generated in
Bahareh Fazeli +4 more
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The Seismic Expression of Core Complex‐Style Extensional Detachment Faults in Rifted Margins
Terra Nova, EarlyView.ABSTRACT The identification of core complex‐style extensional detachment faults (CCDFs) in rifted margins is crucial for accurately restoring their stratigraphic and thermal histories. Yet recognising CCDFs in seismic reflection images is challenging due to their faint topographic expression; the lack of associated abrupt offset in seismic reflections;
Pauline Chenin +3 more
wiley +1 more source
Terra Nova, EarlyView.ABSTRACT Annual tree‐ring oxygen‐isotope values were measured from sections of two fossil logs of Picea mariana (black spruce) recovered from last glacial maximum proglacial sediment in Illinois, USA. Collectively, the specimens date from ca. 25,130 to 24,720 cal years BP.
Dana M. Labotka +2 more
wiley +1 more source
Emergence of Continents Stabilized the Bioavailability of Boron
Terra Nova, EarlyView.ABSTRACT Boron is an essential element for the development of life on Earth; borates stabilize ribose in prebiotic reactions and facilitate metabolism in higher plants. There is, however, a relatively narrow surface boron concentration range over which borates stabilize and serve as a micronutrient rather than a toxin.
Brendan V. Dyck, Jon Wade
wiley +1 more source
Journal of Economic Geology, 2019 Introduction The pseudo-section method, first proposed by Hensen (1971), is used today by scientists to determine the thermodynamic conditions of mineral crystallization and modeling in metamorphic lithology (Hoschek, 2004; Omrani et al., 2013).
Haleh Ghorbani +2 more
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Progress in the Application of Oxygen Isotopes in the Study of Petrogenesis
Yankuang ceshi, 2013 Since different types of rocks on the earth have different oxygen isotope compositions, they can be used to discuss the origins of various rocks and it has become a powerful tool for studying petrology.
LI Tie-jun
doaj
Journal of Economic Geology, 2019 Introduction The formation of the Zagros orogenic belt is attributed to northeastward oblique subduction of the Neotethys beneath the western border of central Iran.
Alireza Zarasvandi +4 more
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Journal of Economic Geology, 2019 Introduction All of the major tectonic zones of Iran, except for the Kopet-Dagh, contain Pan-African crystalline basement. Subduction of the Proto-Tethys at about 630 Ma caused Cadomian arc– and backarc magmatism in the northern margin of Gondwana ...
Forough Malek Mahmoudi +3 more
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