نتایج جستجو برای: contact metamorphism
تعداد نتایج: 164066 فیلتر نتایج به سال:
The metabasite rocks from north of Shahrekord, which is a part of structural zone of Sanandaj-Sirjan, are undergone medium temperature – high pressure metamorphism (eclogite facies). These rocks then were subjected to a retrograde metamorphism (amphibolite facies). A distinct compositional zoning is preserved in fresh garnets which are formed during eclogite facies. The compositional or growth ...
Zircon U-Pb dating is a powerful and widely used geochronologic technique to constrain the timing rates of magmatic high lower-grade metamorphic processes, as well sediment provenance. trace element (TE) compositions also record processes during zircon growth. In this study, laser ablation split-stream (LA-SS)-ICP-MS TE depth-profiling novel two-dimensional mapping techniques are in combination...
Where plates converge, one-sided subduction generates two contrasting thermal environments in the subduction zone (low dT/dP) and in the arc and subduction zone backarc or orogenic hinterland (high dT/dP). This duality of thermal regimes is the hallmark of modern plate tectonics, which is imprinted in the ancient rock record as penecontemporaneous metamorphic belts of two contrasting types, one...
Microdiamonds from the Akluilâk minette dykes (Nunavut, Canada) are similar to diamonds formed in subducted metamorphic rocks. High concentrations of unaggregated nitrogen and positive delta(15)N suggest that the microdiamonds formed within rocks subducted to ultrahigh pressures before being sampled by the minette magma 1.8 billion years ago. This ultrahigh pressure metamorphism in North Americ...
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