High-grade gneisses (amphibolite–granulite facies) of the Namche Barwa and Gyala Peri massifs, in the eastern Himalayan syntaxis, have been unroofed from metamorphic depths in the late Tertiary–Recent. Rapid exhumation (2–5 mm year) has resulted in a pronounced shallow conductive thermal anomaly beneath the massifs and the intervening Tsangpo gorge. The position of the 300 !C isotherm has been ...

Abstract Eclogites represent the highest pressure conditions yet observed from rocks thrust to surface in central Himalaya. A detailed investigation of protolith nature these eclogites is needed better understand pre-Himalayan geological history. Retrogressed were collected Thongmön (Dingri County) and Riwu (Dinggye County), Himalaya, China. We investigated bulk rock major trace elements, Sr-Nd...

Abstract In the southeastern part of Chios Island, Greece, exotic blocks amphibolites and serpentinized peridotite can be found within a narrow, approximately N–S elongated area adjacent to non-metamorphosed sedimentary strata Triassic age its west Cenozoic east. this work, we present for first time petrological mineral chemical data ultramafic rock fragments from SE describe their possible ori...

Lithium concentrations and isotopic compositions in the country rocks (amphibolites and schists) of the Tin Mountain pegmatite show systematic changes with distance to the contact. Both Li and δLi decrease dramatically along a ∼10m traverse from the pegmatite into amphibolite, with Li concentration decreasing from 471 to 68ppm and δLi decreasing from +7.6 to −19.9. Rubidium and Cs also decrease...

Amphibolite blocks from an Archaean (2.9 Ga) trondhjemite-agmatite complex in the Lewisian at Gruinard Bay have a varied trace element and R E E content. Whilst some of the variability is attributable to element mobility during high-grade metamorphism and subsequent trondhjemite magmatism, it is for the main part considered to be a primary feature of the amphibolites. The observed trace element...

The objective of this study is to demonstrate the power of integrating rock physics theory, measurement and simulation to improve facies prediction in an unconventional limestone and shale reservoir. Reliable facies prediction is a challenge in unconventional reservoir characterization because of complex geological heterogeneities. Both deterministic and probabilistic approaches are commonly us...

The Himalayan range exposes a spectacular assemblage of metamorphic rocks from the midand deep crust that have fostered numerous models of how the crust responds to continental collisions. Recent petrogenetically based petrologic and geochronologic studies elucidate processes with unprecedented resolution and critically test models that range from continuum processes to one-time events. The pro...

Abstract In collision-type orogens, where high-pressure and ultrahigh-pressure (HP–UHP) metamorphism usually occurs, deeply subducted continental slabs with eclogitized mafic rocks often undergo recrystallization/overprinting various geothermal gradients after the peak conditions at lower-to-middle-crustal levels. During crustal stabilization, transition from eclogite-to granulite-facies is com...

The discrepancy of geothermal gradients predicted by numerical modeling and recorded peak metamorphic conditions exhumed high/ultrahigh pressure (HP/UHP) rocks triggers many uncertainties on the thermal structure subduction zones, which is especially significant for continental zones. Well-constrained prograde P‒temperature (T) paths HP/UHP reflect change in P–T during are insusceptible to late...