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Geochronology of the Gabbro-mafic microgranular enclaves-granite Associations in the Gejiu District, Yunnan Province and Their Geodynamic Significance

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Acta Geologica Sinica(English Edition) 2012年第3期86卷 748-761页

作者： CHENG Yanbo MAO Jingwen Faculty of the Earth Sciences andResources China University of GeosciencesBeijing 100083 School of Earth and Environmental Sciences James Cook UniversityTownsville4811Australia MLR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing100037

Many igneous rocks distribute in Gejiu tin polymetallic ore-field at Yunnan province, rocks including basalt, gabbro, mafic microgranular enclaves, granites （porphyritic granite and equigranular granite） and akaline rocks. The ages of the granites and akaline rocks which are considered to have genetic connecting with the mineralization have been comfirmed, but the gabbro- mafic microgranular enclaves-granite assemblage＇s ages are still unknown. By means of LA-ICP-MS zircon U-Pb dating, the data of Shenxianshui equigranular granite, the mafic microgranular enclave in Jiasha area, the host rock of the mafic microgranular enclaves and the Jiasha gabbro are around ~80 Ma. Besides the above mentioned data, a group of new ages at ~30 Ma were discovered in this study, which is from gabbro and mafic microgranular enclaves. Based on the previous data and the new data gained this time, we suggest the major geochronology framework of the magmatism and mineralization events in Gejiu area is ~80 Ma, which is consistent with the Late Cretaceous magmatism and mineralization events in the whole southeast Yunnan and west Guangxi area and they were suggested to belong to the same geotectonic setting in late Yenshannian. And the new ages of the ~30 Ma obtained in this study is considered to represent a responding to the complicate tectonic evolution history of the Tibetan orogenic events in Cenozoic.

关键词： gabbro granite mafic microgranular enclaves geochronology geodynamic setting Gejiu

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Magma Mixing Genesis of the mafic enclaves and Related Granitoids in the Kan Granite-Gneiss Complex of Central Côte d’Ivoire: Evidence from Geology, Petrology and Geochemistry

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Open Journal of Geology 2024年第8期14卷 760-786页

作者： Koffi Raoul Teha Koffi Kossonou Jean-Marie Pria Koffi Joseph Brou Alain Nicaise Kouamelan Marc Ephrem Allialy Souad M’Rabet Mineral and Energy Resources Laboratory (LGRME) Flix Houphout-Boigny University Abidjan Ivory Coast Environmental Sciences and Technology Laboratory Department of Earth Sciences Jean Lorougnon-Guede Daloa University Daloa Ivory Coast Laboratory of Geosciences and Environment Department of Geology Ibn Tofal University of Knitra Knitra Morocco

The mafic enclaves from Paleoproterozoic domain are considered to be the results of large-scale crust-mantle interaction and magma mixing. In this paper, petrography, mineralogy and geochemistry were jointly used to determine the origin of the mafic enclaves and their relationship with the host granitoids of the Kan granite-gneiss complex. This study also provides new information on crust-mantle interactions. The mafic enclaves of the Kan vary in shape and size and have intermediate chemical compositions. The diagrams used show a number of similarities in the major elements (and often in the trace elements) between the mafic enclaves and the host granitoids. Geochemical show that the Kan rock are metaluminous, enriched in silica, medium to high-K calc-alkaline I-type granite. The similarities reflect a mixing of basic and acid magma. mafic enclaves have a typical magmatic structure, which is characterized by magma mixing. The genesis of these rocks is associated with the context of subduction. They result from the mixing of a mafic magma originating from the mantle and linked to subduction, and a granitic magma (type I granite) that arises from the partial melting of the crust.

关键词： Magma Mixing mafic microgranular enclaves Host Granitoids Kan Granite-Gneiss Complex West Africa

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Late Early-Cretaceous Magma Mixing in the Langqi Island, Fujian Province, China: Evidences from Petrology, Geochemistry and Zircon Geochronology

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Journal of Earth Science 2020年第3期31卷 468-480页

作者： Liangliang Huang Liyuan Wang Hong-Rui Fan Musen Lin Wenhui Zhang Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China College of Zijin Mining Fuzhou UniversityFuzhou 350116China

The mafic enclaves from Mesozoic intermediate-acid magmatic rocks,widely developed along Fujian coast,are considered to be the results of large-scale crust-mantle interaction and magma *** this paper,petrography,mineralogy,and geochemistry of granites and mafic microgranular enclaves(MMEs)in Langqi Island are studied to provide new information for tracing crust-mantle *** zircon U-Pb dating results show that the Langqi rocks were formed at^101 Ma,which are metaluminous,enriched in silica and high-K calc-alkaline I-type *** enclaves have a typical magmatic structure,which is characterized by magma mixing between high-temperature basic magma and low-temperature acidic magma through *** enclaves and host granites show a tendency to mixed major and trace elements,displaying a clear-cut contact relationship,which is indicative of coeval *** genesis of Langqi rocks is related to the extensional setting caused by the subduction of Paleo-Pacific Plate,and they are the results of mixing of subduction-related metasomatized mantle-derived mafic and induced crustal-melted granitic magma originating from partial melting of the crustal material.

关键词： magma mixing granite mafic microgranular enclaves Langqi Fujian

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Timing of Magma Mixing in the Gangdisê Magmatic Belt during the India-Asia Collision: Zircon SHRIMP U-Pb Dating

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Acta Geologica Sinica(English Edition) 2005年第1期79卷 66-76页

作者： MOXuanxue DONGGuochen ZHAOZhidan GUOTieying WANGLiangliang CHENTao StateKeyLaboratoryofGeo-ProcessesandMineralResources ChinaUniversityofGeosciencesBeijing100083 StateKeyLaboratoryofGeo-ProcessesandMineralResources ChinaUniversityofGeosciencesBeijing100083／／SchoolofEarthScienceandResourcesChinaUniversityofGeosciencesBeijing100083

Abundant mafic microgranular enclaves (MMEs) extensively distribute in granitoids in the Gangdise giant magmatic belt, within which the Qüxü batholith is the most typical MME-bearing pluton. Systematic sampling for granodioritic host rock, mafic microgranular enclaves and gabbro nearby at two locations in the Qüxü batholith, and subsequent zircon SHRIMP II U-Pb dating have been conducted. Two sets of isotopic ages for granodioritic host rock, mafic microgranular enclaves and gabbro are 50.4±1.3 Ma, 51.2±1.1 Ma, 47.0±l Ma and 49.3±1.7 Ma, 48.9±1.1 Ma, 49.9±1.7 Ma, respectively. It thus rules out the possibilities of mafic microgranular enclaves being refractory residues after partial melting of magma source region, or being xenoliths of country rocks or later ***, it is believed that the three types of rocks mentioned above likely formed in the same magmatic event, i.e., they formed by magma mixing in the Eocene (c. 50 Ma). Compositionally, granitoid host rocks incline towards acidic end member involved in magma mixing, gabbros are akin to basic end member and mafic microgranular enclaves are the incompletely mixed basic magma clots trapped in acidic magma. The isotopic dating also suggested that huge-scale magma mixing in the Gangdise belt took place 15-20 million years after the initiation of the India-Asia continental collision, genetically related to the underplating of subduction-collision-induced basic magma at the base of the continental crust. Underplating and magma mixing were likely the main process of mass-energy exchange between the mantle and the crust during the continental collision, and greatly contributed to the accretion of the continental crust, the evolution of the lithosphere and related mineralization beneath the portion of the Tibetan Plateau to the north of the collision zone.

关键词： SHRIMP isotopic dating granites magma mixing mafic microgranular enclaves Qüxü pluton Gangdisê Tibet

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Petrogenesis of Late Triassic granitoids and their enclaves with implications for post-collisional lithospheric thinning of the Liaodong Peninsula,North China Craton

Petrogenesis of Late Triassic granitoids and their enclaves ...

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中国科学院地质与地球物理研究所2007学术年会

作者： Simon A.Wilde Department of Applied Geology Curtin University of Technology P.O.Box U1987PerthWA 6845Australia

Major and trace element,Sr-,Nd- and Hf-isotope,zircon U-Pb and Hf-isotope data are reported for mafic microgranular enclaves and host granitoids from the Xiuyan pluton in the Liaodong Peninsula of the eastern North China Craton,in order to investigate their sources,pedogenesis and tectonic *** zircon U-Pb age of the enclaves(211±1 Ma) is identical to that of the host granite(210±1 Ma),establishing that the mafic and felsic magmas were *** enclaves have high MgO concentrations at low silica contents and positiveε(t) *** are enriched in large ion lithophile and light rare earth elements and depleted in high field strength elements,which can be explained as melts derived from a depleted(asthenospheric) mantle,with some crustal *** host granitoids have high SiO contents,variable initial Sr/Sr ratios and highly negativeε(t) andε(t) values,suggesting they were mainly derived from an ancient crustal source,heated by the input of asthenospheric mantle-derived *** observations,geochronology,geochemistry,Sr and Nd isotopic and zircon Hf iso topic compositions point to a complex petrogenesis,where asthenospheric mantle- and crust-derived magma mixing was coupled with crystal fractionation,thus explaining the genetic link between enclaves and host *** of an asthenospheric mantle component in the Xiuyan granitoids suggests asthenospheric mantle upwelling and decompressional melting of the mantle,indicating that post-collisional lithospheric thinning in the Liaodong Peninsula was initiated in the Late Triassic.

关键词： mafic microgranular enclaves Granite Late Triassic Lithosphenc thinning North China Craton

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A hybrid origin for the Qianshan A-type granite,northeast China:Geochemical and Sr-Nd-Hf isotopic evidence

A hybrid origin for the Qianshan A-type granite,northeast Ch...

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中国科学院地质与地球物理研究所2006学术年会

作者： Simon A.Wilde Department of Applied Geology Curtin University of Technology

Major and trace element,whole rock Sr and Nd isotope and zircon Hf isotope data are reported for a suite of A-type granites and mafic microgranuiar enclaves from the Early Cretaceous(126±2 Ma) Qianshan pluton,Liaodong Peninsula,east China,with the aim of investigating the sources and petrogenesis of A-type *** Qianshan pluton includes hornblende alkali-feldspar granite,graphic biotite granite and mafic microgranuiar *** hornblende alkali-feldspar granites have high SiO2,Fe2O3T/MgO,K2O+Na2O,Rb,Zr and LREE contents and low Ba and Sr concentrations with strongly negative Eu *** high Rb/Sr(87Rb/86Sr = 16.76-24.15) and initial 87Sr/86Sr ratios(0.7215 to 0.7283),negativeεNd(t) values(-14.1 to -16.5) and zircon eHf(t) values(-18.9 to -11.5) indicate they were mainly derived from a crustal source,but with involvement of highεNd(t) and eHf(t) *** biotite granites have similar geochemical features and Sr-Nd-Hf isotopic compositions to enclaves, indicating they were the result of crystal fractionation of evolved mafic magmas,but with involvement of lowεNd(t) andεHf(t) *** mafic enclaves have an igneous texture and contain acicular apatite,suggesting quenching of mafic magmas that have co-mingled with the host *** have low initial 87Sr/86Sr ratios(0.7097-0.7148),negativeεNd(t)(-14.5 to -11.9) and zirconεHf(t)(-17.1 to -6.9) values,and are enriched in LILEs and LREEs and depleted in *** coupled with the high MgO(Mg# up to 54),this indicates derivation from an enriched lithospheric mantle source,but contaminated by crustal materials. Geochemical and Sr-,Nd- and zircon Hf-isotopic compositions rule-out simple crystal-liquid fractionation or restite unmixing as the major genetic link between enclaves and host rocks. Instead,magma mixing of mantle-derived mafic and crustal-derived magmas,coupled with crystal fractionation,is compatible with the *** example shows that at least some A-type granites formed thr

关键词： A-type granite magma mixing Sr-Nd isotopes mafic microgranular enclaves zircon Hf isotopes

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An evolving magma chamber within extending lithosphere:An integrated geochemical,isotopic and zircon U-Pb geochronological study of the Gushan granite,eastern North China Craton

An evolving magma chamber within extending lithosphere:An in...

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中国科学院地质与地球物理研究所2012年度（第12届）学术年会

作者： Xiao-Chun Li Hong-Rui Fan M.Santosh Fang-Fang Hu Kui-Feng Yang Ting-Guang Lan Yongsheng Liu Yue-Heng Yang Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences Division of Interdisciplinary Science Faculty of ScienceKochi University State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences

The Gushan granite,located in the Jiaobei terrane of the eastern North China Craton,carries mafic microgranular enclaves(MMEs) and zoned K-feldspar phenocrysts,and is a typical example of magma generation and evolution in an extensional *** we present whole rock major and trace element geochemistry,Sr-Nd isotopes and zircon U-Pb and Hf isotope data on the granite and its *** granite was emplaced at～120 *** is high in SiO,KO + NaO,LILE and *** low in MgO and HFSE. The granite are also marked by high initial Sr/Sr(0.7103) and low ε(t)(-18.5 to -18.9) and zirconε(t)(-16.6 to—22.0) *** features indicate that the host granite was mainly derived from ancient North China Craton lower ***,petrographic and compositional studies indicate that MMEs are products of mafic-felsic magma interactions in the generation of the granite in the relatively late magmatic *** data suggest that enriched lithospheric mantle was a suitable candidate for the mafic magma end-member involved in the magma interaction *** Sr-Nd isotopic variations within K-feldspar phenocrysts are also evaluated to decipher the magmatic *** spite of a protracted cooling history and evidence of subsolidus alteration,the K-feldspar phenocrysts preserve marked primary Sr-Nd isotopic variations:initialSr/Sr ratios increase from the cores(0.7100-0.7102) to rims(0.7105-0.7110),whereasε(t) values show decrease from the cores(-17.7 to -20.5) to rims (-21.1 to -27.0).The overall isotopic profiles across the K-feldspar phenocrysts are consistent with a continuous magma contamination *** negative Nd isotopic values of some K-feldspar rims suggest that the Precambrian basement rocks in the upper crust are potential candidates for the contaminant. These results indicate that isotopic heterogeneity could be preserved within single crystal from much older,slower cooled plutonic rocks,and those isotopically zoned minerals are effective recorder

关键词： mafic microgranular enclaves Isotopically zoned K-feldspar The Gushan granite Eastern North China Craton

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