Granulite (mafic) - ALEX STREKEISEN
Mafic granulites are characterized by Cpx- and/or Hbl-bearing Opx + Pl ± Grt ± Bt ± Kfs ± Qtz mineral assemblages and are broadly basaltic in composition. The general reaction that first introduce Opx to Hbl + Pl ± Qtz ± Cpx ± Grt-bearing mafic amphibolites below 10 Kbar is:
Mafic granulite rheology: Implications for a weak continental …
2012年11月1日 · Here we report the rheology and fabrics of a reconstituted, fine-grained nominally dry (i.e., no hydrous mineral) mafic granulite (57% plagioclase+24% clinopyroxene+14% orthopyroxene+5% opaque minerals, 0.16–0.28 wt% H 2 O) deformed at 1.1–1.2 GPa pressure in a modified Griggs-type deformation apparatus.
麻粒岩的研究进展与方法 - ysxb.ac.cn
2021年1月4日 · Two phases of granulite facies metamorphism during the Neoarchean and Paleoproterozoic in the East Hebei, North China Craton: Records from mafic granulites. Precambrian Research, 301: 49-64 doi: 10.1016/j.precamres.2017.09.005
Granulite : Properties, Compositions, Uses » Geology Science
2023年11月24日 · Granulites are classified as a type of metamorphic rock, specifically within the high-grade metamorphic category. They are characterized by their fine-grained texture and the presence of minerals that have undergone recrystallization, resulting in the development of granular textures.
On the origin of high-pressure mafic granulite in the Eastern …
2022年4月1日 · In this paper, we focus on migmatitic HP mafic granulite and hosting leucosome from the Namche Barwa region of the EHS, and report systematic petrological and petrochronological data that advance our understanding of the conditions and timescales over which high-grade rocks and partial melts were produced during the Himalayan orogeny.
High-pressure/ultrahigh-temperature mafic and felsic granulites ...
2023年1月1日 · Garnet-bearing mafic and felsic granulites associated with magnetite deposits that have undergone high-pressure (HP) and ultrahigh-temperature (UHT) metamorphism occur in the Yangjiazhai area of the Jiaobei terrane within the Jiao-Liao-Ji Belt, North China Craton.
Ultra high temperature metamorphism of mafic granulites …
2018年11月24日 · The two types of mafic granulite should share the same metamorphic evolution, but show contrasting features in petrography, details of metamorphic reactions in each stage, thermobarometric results, and also the meaning of zircon ages as a result of their different bulk-rock compositions.
Metamorphism and geochronology of high-pressure mafic …
2021年7月2日 · Mineral textures and reaction relationships suggest three metamorphic stages: (1) an eclogite-facies stage (M 1) characterized by the mineral assemblage of garnet + clinopyroxene (omphacite) + hornblende + rutile + quartz; (2) a high-pressure granulite-facies (M 2) stage mainly represented by garnet + clinopyroxene + plagioclase + hornblende ...
Discovery of Mafic Granulites in the Muzhaerte Area, SW Tianshan …
2023年9月15日 · Herein, we report the discovery of orthopyroxene-bearing mafic granulites in the south of the Muzhaerte area, SW Tianshan Orogenic Belt. We conducted petrography observations and geothermobarometry calculations on mafic granulites and determined that the metamorphic conditions of granulites are 760–860 °C and <0.39–0.41 Gpa.
Metamorphism and P-T Evolution of High-Pressure Granulites …
2024年1月26日 · Granulite facies rocks provide important keys to evaluating collisional metamorphism in orogenic belts. The mafic granulites of Baoding in the Fuping Complex of the North China Craton occur within the Trans-North China Orogen (TNCO), a major Paleoproterozoic collisional orogen.