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(PDF) Geochemistry of Meso-and Neoproterozoic mafic

A lot of mafic-ultramafic rocks are group the mafic rocks in Danzhou group and 820 ± 7 Ma hosted in the Sibao group (e.g. in Baotan area of 825 ± 6 Ma S-type granites from northern Guangxi were Luocheng) and Danzhou group (e.g. in Sanmen area of thought to be indicators for arrival of a plume and breakup Longsheng Fig. 1).

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Multistage hydrothermal dolomites in the Middle

 · siliciclastic rocks in the Guangxi–Hunan region South China. Dolomitization locally obliterated original depositional textures leading to many uncertainties in stratigraphic correlations. The stratigraphic equivalents of these rocks are important host rocks for large-scale Pb–Zn and polymetallic deposits in South China (e.g. Shen

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Geochronology of early Mesozoic diabase units in

 · The fact that the late-stage Badu diabase yields a wide range of oxygen fugacity values that are all higher than typical Hawaiian basalts but lower than the early-stage Badu diabase and basalts within the basement suggests that the 250 Ma Badu diabase or basement rocks were assimilated by and thus contributed to the variations in the oxygen

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A one-billion-year-old multicellular chlorophyte Nature

 · Radiometric ages (924 ± 5 Ma and 947.8 ± 7.4 Ma) of diabase sills emplaced in the Cuijiatun and Qiaotou formations are from ref. 22 and ref. 25 detrital zircon ages (<924 ± 25 Ma and <1056 ±

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 · The geochemical characteristics of Longchuan gold-bearing mafic rocks in Guangxi South China. Goldschmidt Sacramento. 2014/6/8. 29. . 2015. . 35(4

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Jurassic granitoid dike in Luodian Guizhou Province

 · In Guizhou province which is mainly covered by sedimentary rocks igneous rocks are scattered in small areas examples include the Permian basalts in the west of Guizhou Late Cretaceous and Permian basic-ultrabasic rocks in the west and south of Guizhou and the huge granites of the Xuefeng period occurring at the Jiuwandashan area on the border between Guizhou and Guangxi as

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Black Nephrite Jade from Guangxi Southern China Gems

 · Originating from Ca-skarn contact metasomatism between limestone bearing siliceous rock and diabase intrusions black nephrite from Guangxi consists mainly of actinolite or ferro-actinolite and minor stilpnomelane andradite apatite epidote quartz diopside pyrrhotite and pyrite.

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The Geochemical Characteristics of Longchuan Gold

 · Exploration Guilin University of Technology Guilin 541004 China ( Correspondence author shiyu_61 163) The Permian mafic rocks (e.g. diabase and basalt) are concentrated in the Longchuan of western Guangxi economically significant gold mineralizations are genetically associated with these mafic rocks.

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Geochronological Sedimentary Structural and

 · Guangdong-Guangxi Intrusive rocks Granite 196189.1 Ma 28 Gneissic granite 169.1136 Ma 29 Weakly deformed granite 137100 Ma 29 Extrusive rocks Layered Mafic-Ultramafic rocks 195 Ma 28 Trachyte 135.4 Ma 30 Rhyolite 10383.4 Ma 31 Hunan-Hubei Intrusive rocks Granite 187.4 Ma 32 Granodiorite 170146 Ma 33

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Carlin-Type Gold Deposits in the Dian-Qian-Gui "Golden

 · They are hosted in Cambrian to Middle Triassic platform carbonate transitional and siliciclastic rocks of the Youjiang basin and locally in Late Permian diabase intrusions or volcaniclastic rocks. These deposits have many characteristics in common with Carlin-type gold deposits in Nevada USA including lithology of host rocks alteration

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Mid-Neoproterozoic mafic rocks in the western Jiangnan

 · Rock classification diagrams for the Mid-Neoproterozoic mafic rocks from Hunan and Guangxi. (a) Nb/Y vs. 10000 (Zr/TiO 2) diagram (after Winchester and Floyd 1977). (b) SiO 2 vs. FeOT/MgO diagram (after Miyashiro 1974). Data for mafic rocks in Guzhang and Qianyang are from Zhou et al. 2007 Wang et al. 2008a respectively.

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Mineralogy geochemistry and petrogenesis of green

 · The intrusive rocks of the Dahua green nephrite deposit in Guangxi are diabase and gabbro from the Variscan orogeny and the surrounding rocks are mainly fine-grained gray-black dolomitic limestone (Li et al. 2011). In nephrite surrounded by dolomitic limestone the iron content is relatively low (Yu et al. 2016).

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Jurassic granitoid dike in Luodian Guizhou Province

 · In Guizhou province which is mainly covered by sedimentary rocks igneous rocks are scattered in small areas examples include the Permian basalts in the west of Guizhou Late Cretaceous and Permian basic-ultrabasic rocks in the west and south of Guizhou and the huge granites of the Xuefeng period occurring at the Jiuwandashan area on the border between Guizhou and Guangxi as

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Silicon isotope geochemistry of micro-fine disseminated

 · Quartz was studied with respect to its silicon isotopic composition and cathodoluminescence in micro-fine disseminated gold deposits in SW Guizhou and NW Guangxi. The results showed that quartz in wall rocks ores and that in association with hydrothermal silicification are distinctive in silicon isotopes and cathodoluminescence characters. Quartz in association with primary silicification is

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Feng GUO----Guangzhou Institute of Geochemistry Chinese

1. Guo Feng Fan Weiming Li Chaowen Zhao Liang Yang Jinhui 2011. Multi-stage crust-mantle interaction in SE China Temporal thermal and compositional constraints from the Mesozoic felsic volcanic rocks in eastern Guangdong-Fujian provinces.

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Geochronology of early Mesozoic diabase units in

 · The fact that the late-stage Badu diabase yields a wide range of oxygen fugacity values that are all higher than typical Hawaiian basalts but lower than the early-stage Badu diabase and basalts within the basement suggests that the 250 Ma Badu diabase or basement rocks were assimilated by and thus contributed to the variations in the oxygen

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Black Nephrite Jade From Guangxi Southern China

Figure 3. Regional geologic map of the Guangxi black nephrite primary deposit. The deposit occurs at the contact zone between marine carbonate rock bearing chert/siliceous rock/clay rock deposited from the Upper Carbonifer-ous to Lower Permian periods (C 2 –P 1) and diabase emplaced during the late Permian period (βμ 4). The diabase dis-

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Geochemistry and Metallogenic Model of Carlin-Type

 · 2.2 Igneous rocks in SW Guizhou Outcrops of both intrusive and extrusive igneous rocks including basalts diabase vitric tuff and meta-alkaline ultrabasic rocks occur in the area (Fig.2). Several sequences of basalts from Carboniferous to Late Permian are exposed in

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New identification and significance of Early Cretaceous

 · Among the mafic rocks in Baotan area Mandong gabbros and diabases have the lowest SiO 2 (50.86–54.40 wt ) and highest εNd (t) values (− 9.53 to −

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Minerals Free Full-Text Early Jurassic Mafic

A suite of mafic intrusions composed of diabase and micro-gabbro outcrops in the Jingxi area of southern Youjiang Basin SW China. This study conducts geochronological geochemical and Sr ndashNd isotopic analyses on the mafic intrusions in Jingxi with the aim of determining their petrogenesis tectonic setting and metallogenic implications. Zircon U ndashPb dating for the mafic

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A systematic engineering geological evaluation of diabase

Dagangshan hydropower station is located in the middle of Dadu River Southwest China. Many diabase dikes were exposed in the adamellite granite body during excavation of the underground caverns. The dikes are highly directional have crushed

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Banqi (Sed-Au #1) deposit in Guizhou China

Comments. Mined out ( ) Wall-rocks are mostly sheared. Average gold content in pyrite 257.6 g/t (Mao 1991). Gold fineness 900‰ (Liu and Geng 1985).

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PETROGENSIS OF HED METEORITES AND IMPLICATIONS

 · diabase (Tirhert) basalt (NWA 11602 and NWA 11603) and breccia (GRV 13001 and NWA 11598) were selected for systemic lithological observation and geochemistry analysis. Our studies are mainly concentrated on the struc-ture and texture of rocks major and trace elements geochemical characteristics in terms of whole rocks as well as minerals.

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Black Nephrite Jade from Guangxi Southern China

Originating from Ca-skarn contact metasomatism between limestone bearing siliceous rock and diabase intrusions black nephrite from Guangxi consists mainly of actinolite or ferro-actinolite and minor stilpnomelane andradite apatite epidote quartz diopside pyrrhotite and pyrite.

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Geochemistry of Meso- and Neoproterozoic mafic

Guangxi. Major rock types in the Danzhou group include metamorphic pelitic-silty rocks with flysch rhythm and Bouma sequence exhibiting turbidity flow features lesser diabase hosted in Sibao

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 · 13.Diabase Dykes in Sanqisan Uraniun Deposit and Its Relation with Uranium Mineralization Guangxi. Acta Geologica Sinica(English Edition) 2014 88(supp.2) . 14 lfur Isotope Characteristics of the metal sulfide and the Source of Sulfur in

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Mid-Neoproterozoic mafic rocks in the western Jiangnan

 · Rock classification diagrams for the Mid-Neoproterozoic mafic rocks from Hunan and Guangxi. (a) Nb/Y vs. 10000 (Zr/TiO 2) diagram (after Winchester and Floyd 1977). (b) SiO 2 vs. FeOT/MgO diagram (after Miyashiro 1974). Data for mafic rocks in Guzhang and Qianyang are from Zhou et al. 2007 Wang et al. 2008a respectively.

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-glut.edu.cn

 · The geochemical characteristics of Longchuan gold-bearing mafic rocks in Guangxi South China. Goldschmidt Sacramento. 2014/6/8. 29. . 2015. . 35(4

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Geochronology and geochemistry of Neoproterozoic mafic

As shown in Figure 1b the Neoproterozoic mafic rock belt in western Hunan extends southward to the Longsheng area of northern Guangxi Province. The mafic rocks from Longsheng yielded a single zircon U–Pb age of 761±8 Ma (Ge et al. Reference Ge Li Li and Zhou 2001) which is indistinguishable from that of the Tongdao rocks (772±11 Ma). It

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Devonian Radiolarian Faunas from South China

cherty rocks in west Yunnan and Luo et al. (2002) report Givetian radiolarians from the Tanhe Formation near Nanning in Guangxi Province. Since 1996 Devonian radiolarian-bearing cherty samples have been collected systematically from the Yangti Wuxingling and Bancheng areas in Guangxi the Bazhai and Huohong areas in

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Provenances of the Ediacaran sedimentary rocks in the

Abstract The terrigenous clastic sedimentary rocks in the Zhuguangshan uranium ore field of the Cathaysia Block South China were selected to reveal their petrogenesis and implications for granitoids-related uranium mineralization in South China. LA-ICP-MS U-Pb dating of detrital zircons shows that the Ediacaran terrigenous clastic sedimentary rocks in the Zhuguangshan area are characterized

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Provenances of the Ediacaran sedimentary rocks in the

Abstract The terrigenous clastic sedimentary rocks in the Zhuguangshan uranium ore field of the Cathaysia Block South China were selected to reveal their petrogenesis and implications for granitoids-related uranium mineralization in South China. LA-ICP-MS U-Pb dating of detrital zircons shows that the Ediacaran terrigenous clastic sedimentary rocks in the Zhuguangshan area are characterized

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Geochronology of Two Mafic Intrusions in Funing Yunnan

Silurian and Cretaceous rocks (Figure 1). The early mafic intrusion are mostly Ti- gabbro-diabase facies which cause thermal metamorphism when they are in contact with surrounding rocks. Because of the varying compositions of the host rocks the metamorphic rocks

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diabase rocks in malaysiaBINQ Mining

 · The diabase artificial aggregate crushing and processing plant. Diabase is a hard rock processing equipment of artificial limestone aggregate Guangxi region can not be the diabase processed into the design of concrete aggregate. »More detailed

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Geochronology of Neoproterozoic mafic rocks and

 · rocks within the Fanjingshan Group include pillow basalts (Fig. 2) gabbro diabase gabbro–diabase olivine pyroxenite etc. The Fan-jingshan Group underwent greenschist-facies metamorphism in which the volcanic–sedimentary rocks have been replaced by chlorite tremolite epidote zoisite calcite and quartz. Moreover

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