The studied mafic granulites are located at Xiwangshan, Xuanhua region in the north of the Trans-North China Orogen (TNCO), occurring as lens within tonalite-trondhjemite-granodiorite (TTG) gneisses in the eastern part of the Xiwangshan area. The rocks contain the representative granulite-facies minerals such as garnet, clinopyroxene, …
You can use the CaO-MgO-FeO triangular diagram or the mg-c-al-alk triangle of Niggli which differentiate between Para- and ortho-amphibolite. Also relict texture of igneous rocks such as relict ...
Amphiboles are common constituents of many igneous (diorite, andesite, some granites) and metamorphic (mostly amphibolite) rocks. Most common amphibole is hornblende. This mineral has no definite composition either. It is therefore also divided into several minerals. However, these subdivisions are not important here because the identification ...
garn et amphibolite only occurs in the matrix. It shows direct contact with garnet (Figure 3f). The phengite has X Si values ranging from 0.578 . to 0.585 (Figure 5b). Whereas X Mg values range .
The driving force for the deformation of amphibolite is likely to be the corner flow in the overlying mantle wedge induced by the subduction of the Indian lithospheric slab (Wu et al., 2019). Hence, amphibolite is a rock type that competes strongly with the generally accepted granulite in the mid-lower crust of the Tibetan Plateau.
— Hornblende is common in the amphibolite exposed at Pete's Landing SE SE Sec. 3 T.41N R.1E (Sims et al., 1985). — Hornblende is common in the granodiorite phases of the Mellen granite pluton, such as found in Sec. 32-36 T.45N R.3W and Sec. 1 and 2 T.44N R.3W (Katzman, 1968).
The orthoamphibolite includes mainly amphibole (hornblende) and albite, and even small amounts of epidote, zoisite, chlorine, and quartz. The accessory ingredients are …
This is coincidence with the contemporaneous metamorphism and partial melting of garnet amphibolite (43.5 ± 1.3 Ma; Zeng et al., 2011) in the Yardoi dome. In addition, Sr-Nd isotopes of the Liemai two-mica granite are similar to those of the garnet amphibolite . This indicates that the garnet amphibolite would be the major source rock …
The CMSZ, extending southwardly to northwestern Laos and northwardly to the central Qiangtang, separates the Baoshan-Tengchong Block (BTB) to the west from the Lanping-Simao Block (LSB) to the east (Li C et al., 2006; Metcalfe I, 1996, 2002, 2011).The BTB comprises the Proterozoic low-grade to amphibolite-facies metamorphic basements …
Special names, other than those already mentioned, that have been given to amphibole-rich rocks used as gemrocks follow: Arizona zebra stone - an amphibolite from near Prescott, Yavapai County, Arizona, that consists of bands made up largely of black amphibole alternating with bands that consist largely of off-white plagioclase feldspar.
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This study presents a global compilation of geochemical data on amphibolite (n = 6,500), granulite (n = 4,000), and eclogite (n = 200) facies lithologies and quantifies trends, uncertainties, and sources of bias in the deep crust sampling. The continental crust's Daly Gap is well documented in amphibolite and most granulite facies lithologies.
The amphibole in amphibolite is a member of the calcic group and this amphibole is Magnesio-Hornblende type. The plagioclases in the greenschist is pure albite (An 3.29 - 3.6), and in the epidote amphibolite is oligoclase (An 19.5 - 24.2), while in the amphibolites is oligoclase (An 16.9 - 26.6). ... Leake, B.E., et al. (1997) Nomenclature of ...
Amphibolite: Mineral information, data and localities. of Amphibolite associated with Mount Tennyson Molybdenite Mine (Mount Tennyson Molybdenum Mine; Yetholme Mine) …
The meaning of AMPHIBOLITE is a usually metamorphic rock consisting essentially of amphibole.
Category: Science & Tech amphibolite, a rock composed largely or dominantly of minerals of the amphibole group. The term has been applied to rocks of either igneous or metamorphic origin. In igneous rocks, the term hornblendite is more common and restrictive; hornblende is the most common amphibole and is typical of such rocks.
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This study presents a global compilation of geochemical data on amphibolite (n = 6,500), granulite (n = 4,000), and eclogite (n = 200) facies lithologies and quantifies …
An important group of rock-forming minerals in igneous and metamorphic rocks, amphiboles share a similar crystal structure and cleavage pattern, but contain different proportions of sodium (Na), calcium (Ca), iron (Fe) …
amphibolite, a rock composed largely or dominantly of minerals of the amphibole group. The term has been applied to rocks of either igneous or metamorphic origin. In igneous rocks, the term hornblendite is more common and restrictive; hornblende is the most common amphibole and is typical of such rocks. Hornblendite is an ultramafic rock …
Amphibolite. Amphibolite is a coarse-grained metamorphic rock, predominantly composed of mineral amphibole and plagioclase feldspar.It can also contain minor amounts of other metamorphic minerals such as biotite, epidote, garnet, wollastonite, andalusite, staurolite, kyanite, and sillimanite.Amphibolite is found around metamorphic …
In this contribution, garnet-bearing mafic granulite and amphibolite enclaves within the Pingyang trondhjemitic pluton (Fig. 3) have been investigated based on petrography, mineral chemistry, geothermobarometry and SIMS U-Pb dating of zircons, to retrieve metamorphic P-T-t trajectories.In addition, SIMS U-Pb dating of zircons of the …
Fatehi et al. (2017) propose that hornblende in some garbenschist may even precipitate from hydrothermal fluids, which further complicates peak pressure (P) ... amphibolite, serpentinite and minor psammitic and pelitic schists. The PBA has been correlated with the lower-grade Ordovician Kulutingwak Formation (Trettin & Frisch, ...
1. Introduction. Granulite- and amphibolite-facies metamorphic rocks are principle constituents of Earth's lower crust (Hayob et al., 1989; Jamieson et al., 2011).Few high pressure (HP) mafic granulites or amphibolites in collisional orogens are formed at convergent plate margins during the geodynamic processes of subduction-exhumation, …
Amphibolite is a dark-colored, weekly-foliated metamorphic rock that contains plagioclase feldspar and amphibole of the hornblende group. The amphibole is …
: a usually metamorphic rock consisting essentially of amphibole Examples of amphibolite in a Sentence
The discovery of Paleoproterozoic HP granulites in the North China Craton (NCC) by Wang et al. (1991) and Zhai et al. (1993) triggered several studies in this region. Based on the metamorphic evolution of the HP granulites in the Hengshan area (Fig. 1), central NCC and a comparison of the basement rocks with those in other areas of the …
Leiss et al. (2002) determined textures of amphibolite and quartz amphibolite and found point distributions in one quartz amphibolite sample, and patterns resembling a-fiber textures in three samples. They explain the different textures with variations in the strain regime.
As described above, some inherited magmatic zircon core yielded weighted mean ages of 2527 ± 9 Ma and 2544 ± 36 Ma for Grt amphibolite (Zhai et al., 2000b, Liu et al., 2012b), and these ages are interpreted as protolith ages. Zhang et al. (2003) also obtained a similar protolith age of 2530 ± 17 Ma for an amphibolite in the Laizhou area.
The Yingshan banded iron formation in South China underwent amphibolite-facies metamorphism and contains abundant co-existing magnetite, garnet, amphibole, and biotite, providing a great opportunity for calibrating inter-mineral Fe isotope fractionation for these minerals. ... Shahar et al. (2008) was the first to propose the fractionation of ...