نتایج جستجو برای: greenschist

تعداد نتایج: 222  

Journal: :Environmental sciences proceedings 2021

The Hera Au-Ag-Pb-Zn deposit of central New South Wales, Australia with a total undepleted resource 3.6 Mt @ 3.3 g/t Au, 25 Ag, 2.6% Pb and 3.8% Zn occurs on the SE margin Cobar Basin. It is hosted by shallow marine Mouramba Group overlying turbiditic Amphitheatre Group. siltstones comprise various mixtures quartz, plagioclase, muscovite-phengite, biotite clinochlore, along accessory titanite i...

Journal: :Precambrian Research 2022

New U-Pb monazite ages from amphibolite-facies metasedimentary rocks the Tennant Region, Murphy Inlier and intervening East area, together with existing data, reveal presence of an 1860–1840 Ma tectono-magmatic domain over 600 km long towards centre North Australian Craton. In-situ ion probe dating biotite-hosted in schist Region yielded age 1858 ± 7 Ma, which is attributed to north–south short...

Journal: :Central European Geology 2021

Abstract The Algyő High (AH) is an elevated crystalline block in southeastern Hungary covered by thick Neogene sediments. Although productive hydrocarbon reservoirs are found these sequences, numerous fractured also occur the pre-Neogene basement of Pannonian Basin. Based on analogies, rock body AH might play a key role fluid storage and migration; however, its structure therefore reservoir pot...

Journal: :Geological Magazine 2022

Abstract This contribution provides insights into ocean-floor hydrothermal metamorphism of the fast-evolving Dinaridic Neotethys. Mineralogical, geochemical and Sr isotope data collected from altered ophiolites non-ophiolite basalts/andesites tuffs active continental margin are consistent with alteration trajectories that reflect host-rock composition. suggests fluxes were restricted within a s...

Journal: :Tectonics 2021

The E-vergent Northern Apennines formed by Oligocene-Miocene convergence and westward subduction of Adria beneath Europe. Extension ensued in the Mid-Late Miocene reflecting lower plate roll-back causing opening back-arc Tyrrhenian Sea. Post-orogenic extension is commonly advocated as main driver exhumation belt's inner domain high-pressure/low-temperature (HP-LT) rock units. Acquadolce Subunit...

Journal: :Swiss Journal of Geosciences 2021

Abstract Exhumation of basement rocks on the seafloor is a worldwide feature along passive continental margins and (ultra-) slow-spreading environments, documented by dredging, drilling or direct observations diving expeditions. Complementary from exhumed ophiolites in Alps allow for better understanding underlying processes. The Aiguilles Rouges ophiolitic units (Val d’Hérens, Switzerland) are...

Journal: :journal of sciences, islamic republic of iran 2010
m. jamshidi badr

soursat metamorphic complex (smc) in west of takab city is one of the polyphase metamorphic terrenes in northern sanandaj-sirjan metamorphic belt of iran. the smc composed mainly of metasedimentary rocks associated with granitic intrusions. based on metamorphic rocks, two metamorphic phases could be separate in the complex. m1 is representative of regional metamorphisms which varies from greens...

M. Jamshidi Badr

Soursat Metamorphic Complex (SMC) in west of Takab city is one of the polyphase metamorphic terrenes in northern Sanandaj-Sirjan metamorphic belt of Iran. The SMC composed mainly of metasedimentary rocks associated with granitic intrusions. Based on metamorphic rocks, two metamorphic phases could be separate in the complex. M1 is representative of regional metamorphisms which varies from greens...

Journal: :Swiss Journal of Geosciences 2022

Abstract Here we describe the structure, high-pressure, low-temperature (HP-LT) metamorphism and tectonic evolution of Briançonnais distal margin units from south Western Alps. The studied area extends southwest Dora-Maira (U)HP basement east-southeast classical nappes. A new structural map accompanied by geological profiles shows thrusting oceanic nappes (Monviso Queyras units) onto (D1 D2 lat...

2006
L. A. COOGAN

The mechanism of heat extraction from the lower oceanic crust near the ridge axis is poorly constrained despite its importance for understanding both the process of accretion of the plutonic complex and the mass fluxes associated with ridge hydrothermal systems. We have investigated the role of zones of focussed fluid flow in the plutonic complex of the Oman ophiolite in the near-axis cooling o...

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