Continental crust (density ~2.8 g·cm-3) resists subduction into the earth's mantle (~3.3 because of buoyancy. However, more than 20 recognized ultrahigh-pressure (UHP) terranes have been documented; these occurrences demonstrate that not only is continental subducted to depths as great 150 km, but also some supracrustal rocks were then exhumed surface. UHP are composed mainly contain minor amounts minerals such coesite or diamond, indicative P > 2.5 GPa. In general, quartzofeldspathic units...

ABSTRACT Ultramafic blocks that themselves contain eclogite lenses in the Triassic Su‐Lu ultrahigh‐ P terrane of eastern China range size from hundreds metres to kilometres. The ultramafic are enclosed quartzofeldspathic gneiss early Proterozoic age. rocks include garnetiferous lherzolite, wehrlite, pyroxenite, and hornblende peridotite. Garnet lherzolites relatively depleted Al 2 O 3 (<3.8wt%), CaO (<3.2%) TiO (<0.11 wt%), low total REE contents (several p.p.m.), suggesting...

Journal Article Talc-, Magnesite- and Ti-Clinohumite-Bearing Ultrahigh-Pressure Meta-Mafic Ultramafic Complex in the Dabie Mountains, China Get access R. Y. ZHANG, ZHANG 1DEPARTMENT OF GEOLOGICAL AND ENVIRONMENTAL SCIENCES, STANFORD UNIVERSITYSTANFORD, CA 94305, USA Search for other works by this author on: Oxford Academic Google Scholar J. G. LIOU, LIOU * *Corresponding B. L. CONG 2INSTITUTE GEOLOGY, ACADEMIA SINICABEIJING 100029, CHINA of Petrology, Volume 36, Issue 4, August 1995, Pages...

Representative diamond‐bearing gneisses and dolomitic marble, eclogite Ti‐clinohumite‐bearing garnet peridotite from Unit I at Kumdy Kol whiteschist II Kulet, eastern Kokchetav Massif, northern Kazakhstan, were studied. Diamond‐bearing contain variable assemblages, including Grt+Bt+Qtz±Pl±Kfs±Zo±Chl±Tur±Cal minor Ap, Rt Zrn; abundant inclusions of diamond, graphite+chlorite (or calcite), phengite, clinopyroxene, K‐feldspar, biotite, rutile, titanite, calcite zircon occur in garnet. marbles...

An ultra‐high‐pressure (UHP) metamorphic slab at Yangkou Beach near Qingdao in the Sulu region of China consists blocks eclogite facies metagabbro, metagranitoid, ultramafic rock and mylonitic orthogneisses enclosed granitic gneiss. A gradational sequence from incipiently metamorphosed gabbro to completely recrystallized coesite formed ultra‐high‐pressures was identified a single 30 m block; metagabbro is preserved core whereas occurs along block margins. The contains an igneous assemblage...

Other| October 01, 1996 Occurrences of intergranular coesite in ultrahigh-P rocks from the Sulu region, eastern China; implications for lack fluid during exhumation J. G. Liou; Liou Stanford University, Department Geological and Environmental Sciences, Stanford, CA, United States Search other works by this author on: GSW Google Scholar R. Y. Zhang Author Article Information Publisher: Mineralogical Society America First Online: 02 Mar 2017 Online Issn: 1945-3027 Print 0003-004X Copyright ©...

Very low temperatures at high pressures have long been believed to constitute a forbidden zone not realized in Earth. However, recent studies of ultrahigh pressure (UHP) terranes indicate that these rocks experienced such conditions. Liou et al. discuss the implications observations for plate tectonics.

The occurrence of coesite and diamond in regional ultrahigh-pressure metamorphic rocks requires that formed at pressures 3 to 4 GPa (100 120 km below the Earth's surface) have been transported back surface ([1][1]). L. Dobrzhinetskaya et al . suggest garnet lherzolite from

Other| February 01, 1996 Coesite inclusions in dolomite from eclogite the southern Dabie Mountains, China; significance of carbonate minerals UHPM rocks R. Y. Zhang; Zhang Stanford University, Department Geological and Environmental Sciences, Stanford, CA, United States Search for other works by this author on: GSW Google Scholar J. G. Liou American Mineralogist (1996) 81 (1-2): 181–186. https://doi.org/10.2138/am-1996-1-222 Article history first online: 02 Mar 2017 Cite View This Citation...

Ultrahigh-pressure eclogites are metabasic rocks that have equilibrated at pressures within the coesite P-T stability field. This paper reviews their occurrences and petrographic characteristics in exhumed ultrahigh-pressure metamorphic terrenes certain major Phanerozoic continental plate—collision belts. Unequivocal identification of depends on presence relict or polycrystalline quartz pseudomorphs after earlier coesite. However, preservation such distinctive evidence is best sporadic,...

Abstract Altered quartz‐rich and nearly quartz‐free eclogitic rocks completely retrograde garnet amphibolites occur as blocks or lenses in gneisses at Weihai, northeastern tip of the Sulu ultrahigh‐P belt. Eclogitic with assemblage ± clinopyroxene coesite + rutile have experienced three‐stage metamorphic events including ultrahigh‐pressure eclogite, granulite amphibolite facies. Granulite event is characterized by formation hypersthene salite plagioclase hornblende corona between quartz...

Exsolution microstructures have recently been identified in ultrahigh-pressure (UHP) ultramafic and eclogitic minerals from several orogenic belts, including the Western Gneiss Region, Norway; Alpe Arami, Switzerland; Bohemian massif, central Europe; Kokchetav Kazakhstan; Dabie-Sulu UHP terrane, east-central China; Sulawesi, Indonesia. They include ilmenite rods magnetite lamellae olivine; K-feldspar, Mg-Al-Cr titanomagnetite and/or ilmenite, quartz, garnet clinopyroxene; pyroxene rutile...

A stratigraphically coherent blueschist terrane near Aksu in northwestern China is unconformably overlain by unmetamorphosed sedimentary rocks of Sinian age (∼600 to 800 Ma). The pre-Sinian metamorphic rocks, termed the Group, were derived from shales, sandstones, basaltic volcanic and minor cherty sediments. They have undergone multi-stage deformation transitional blueschist/greenschist-facies metamorphism, consist strongly foliated chlorite-stilpnomelane-graphite schist,...

Abstract High entropy alloys (HEAs) with entropy‐driven stabilization are attractive in potassium‐ion batteries (PIBs); however, they suffer from phase segregation due to the disparity of versatile components. Confining multifarious metals into same lattice using ligands full‐coordination abilities allows for delicate control at nanoscale level and thus decreases atom diffusion. This chemical synthesis can suppress realize HEAs PIB anodes. Herein, a new MnCoNiCuZn‐based HEA nanoparticle...

The Maowu garnet‐bearing ultramafic body (∼ 250 × > 50 m 2 ) in the Dabie ultrahigh‐pressure (UHP) terrane has several distinct petrologic characteristics: (i) most rocks are layers of ultramafics including orthopyroxenite and clinopyroxenite with minor harzburgite omphacite‐rich layers; these compositional range thickness from 5 cm to 1.6 m; (ii) rutile is ubiquitous abundant (up 1–2 vol%); (iii) monazite common as inclusions silicates a matrix phase; (iv) exsolved plates magnetite occur...

Abstract The Xugou garnet peridotite body of the southern Sulu ultrahigh‐pressure (UHP) terrane is enclosed in felsic gneiss, bounded by faults, and consists harzburgite lenses clinopyroxenite eclogite. composed variable amounts olivine (Fo 91 ), enstatite (En 92−93 (Alm 20−23 Prp 53−58 Knr 6−9 Grs 12−18 diopside rare chromite. ultramafic protolith has a depleted residual mantle composition, indicated high‐Mg number, very low CaO, Al 2 O 3 total REE contents compared to primary other...

Abstract The pre‐pilot hole (PP1) of the Chinese Continental Scientific Drilling Project (CCSD) recovered drill core samples from a 118 m‐thick section peridotites located at Zhimafang in southern Sulu UHP terrane, China. consist phlogopite‐bearing garnet lherzolite, harzburgite, wehrlite and dunite. Some peridotite layers contain magnesite Ti‐clinohumite, are characterized by LREE LILE enrichment HFSE depletion. Phlogopite (Phl) occurs matrix is LILE‐enriched with low Zr/Hf ratios...

Abstract Although oriented rutile needles in garnet have been reported from several ultrahigh‐pressure (UHP) rocks and considered to be important UHP indicators, their crystallographic features including growth habit lattice correspondences with host never properly characterized. This paper presents a detailed analytical electron microscopic (AEM) study on evenly distributed of two eclogitic Sulu. Some one diamondiferous quartzofeldspathic rock the Saxonian Erzgebirge, high‐pressure (HP)...

Abstract Xenolith-bearing Paleozoic kimberlites and Cenozoic basalts from the eastern part of North China craton provide unusual insights into intraplate processes Phanerozoic lithospheric evolution. peridotite xenoliths represent samples ancient cratonic mantle; P-T estimates show that a thick (˜230 km), cold (ca 40 mW/m2) lithosphere existed beneath during mid- Ordovician time. However, Tertiary sample thin (> 90 hot (mean geotherm ca 80 mW/m2), compositionally heterogeneous same area in...

Abstract The Dabie-Sulu ultrahigh-pressure (UHP) terrane is the largest in world. Mafic-ultramafic rocks occur as ubiquitous minor components it, and preserve UHP index minerals such coesite microdiamond. Eclogites garnet peridotites together with their country including quartzofeldspathic, pelitic, psammatic, carbonate were subjected to coeval meta-morphism during Triassic collision between Sino-Korean Yangtze cratons. This review summarizes petrological geochemical characteristics of...

Abstract Minor epidote‐zoisite, phengite, glaucophane, nyböite, talc, magnesite, and dolomite occur as matrix phases or mineral inclusions in some ultrahigh‐pressure (UHP) rocks from the Dabie‐Sulu terrane. Some of these contain coesite pseudomorphs appear to have been equilibrium with at time formation. Their occurrences UHP together experimentally determined calculated phase relations indicate that they are stable mantle depths relatively low‐temperature environments. Because apparently...