GEOCHEMISTRY OF EARLY CRETACEOUS TRACHYTES OF DONGLINGTAI FORMATION FROM THE XISHAN AREA, BEIJING： CONSTRAINTS ON MELTING OF LOWER MAFIC CRUST-中国期刊网

摘要 TheearlyCretaceoustrachytesofDonglingtaiFormationinXishan,BeijingarecharacterizedbyslightEunegativeanomalyandsignificantenrichmentinLREE,LILE(Ba,KandSr)anddepletionofNb-Ta-Ti,Th-U.ThesetrachyteshavebeenhighlyenrichedbySrandNdisotopicsignatures(87Sr/86Sr(t)=0.70638～0.70672,εNd(t)=-16.3～-15.7),overlappingSr-NdisotopicrangeoflateMesozoicmaficigneousrocksintheregion.TakingintoaccountNb-TafractionationandhighZr/Smratioforthesetrachytes,weconsiderthatthetrachytesofDonglingtaiFormationarederivedfromthegarnet-bearingamphiboliteinthelowercrustcomposedofgarnet+plagioclase±amphibole±pyroxeneresidualphases.OnthebasisofthemeltingexperimentalresultsofcrustalmaterialsandregionalextensionaltectonicsduringlateMesozoic,itisconcludedthatthethermalinputfromunderplatingbasalticmeltresultsinthepartialmeltingoflowercontinentalcrusttogeneratethetrachytesofDonglingtaiFormation.AndthecharacteristicsofhighSrandBaforthesetrachytessuggestthatpartofunderplatingbasaltsshouldtakeashareinpartialmeltingatleast.

1HAN Gang;FU Xiao-ping;LIU Zhong-jian;WANG Xin. A New Angiosperm Genus from the Lower Cretaceous Yixian Formation, Western Liaoning, China.地质学,2013-04.
2WANG Xuri;TAN Kai;LU Liwu;LI Tao;CAI Qingqing. A New Genus of Paleonisciformes from the Early Cretaceous Longjiang Formation in Heilongjiang Province, China.地质学,2018-03.
3. The Origin of Bedded Cherts of the Early Permian Gufeng Formation in the Lower Yangtze Area, Eastern China.地质学,1995-04.
4CHEN Guo-neng. FORMATION OF THE CRUSTAL MELTING LAYER AND ITS RELATIONS TO THE DEFORMATION OF CONTINENTAL CRUST: AN EXAMPLE FROM SOUTHEAST CHINA.地质学,2001-01.
5JI Shu-an;ZHANG Lijun;ZHANG Shudong;ZHANG Lijun 1;JIANG Shan. Large-Sized Ankylosaur （Dinosauria） from the Lower Cretaceous Jiufotang Formation of Western Liaoning, China.地质学,2014-04.
6GUO Junfeng;LI Yong;HAN Jian;ZHANG Xingliang;ZHANG Zhifei;OU Qiang;LIU Jianni;SHU Degan;Shigenori MARUYAMA;Tsuyoshi KOMIYA. Fossil Association from the Lower Cambrian Yanjiahe Formation in the Yangtze Gorges Area, Hubei, South China.地质学,2008-06.
7FranciscoHervé;C.MarkFanning. Early Cretaceous subduction of continental crust at the Diego de Almagro archipelago, southern Chile.地质学,2003-04.
8. The Origin of the Early Proterozoic Kuandian Complex: Evidence from Geochemistry.地质学,1997-01.
9YUAN Chongxi. A New Genus and Species of Sapeornithidae from Lower Cretaceous in Western Liaoning, China.地质学,2008-01.
10LIU Chaohui;LIU Shuwen;LI Qiugen;Lü Yongjun;K. H. PARK;Y. S. SONG. Petrogenesis of the Paleoproterozoic Guandishan Granitoids in Shanxi Province： Constraints from Geochemistry and Nd Isotopes.地质学,2006-06.

GEOCHEMISTRY OF EARLY CRETACEOUS TRACHYTES OF DONGLINGTAI FORMATION FROM THE XISHAN AREA, BEIJING： CONSTRAINTS ON MELTING OF LOWER MAFIC CRUST

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GEOCHEMISTRY OF EARLY CRETACEOUS TRACHYTES OF DONGLINGTAI FORMATION FROM THE XISHAN AREA, BEIJING： CONSTRAINTS ON MELTING OF LOWER MAFIC CRUST

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