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Article: Petrology and geochronology of the charnockite from the southern Gangdese belt, Tibet: Evidence for the Andean-type orogen

TitlePetrology and geochronology of the charnockite from the southern Gangdese belt, Tibet: Evidence for the Andean-type orogen
青藏高原岡底斯帶南部的紫蘇花崗巖:安第斯型造山作用的證據
Authors
KeywordsAndean-Type Orogen (安第斯型造山作用)
Charnockite (紫蘇花崗巖)
Gangdese Batholith (岡底斯巖基)
Petrology (巖石學)
Tibet (青藏高原)
Zircon U-Pb Dating (鋯石U-Pb定年)
Issue Date2009
PublisherScience Press (科學出版社). The Journal's web site is located at http://www.ysxb.ac.cn/ysxb/ch/index.aspx
Citation
Acta Petrologica Sinica, 2009, v. 25 n. 7, p. 1707-1720 How to Cite?
巖石學報, 2009, v. 25 n. 7, p. 1707-1720 How to Cite?
AbstractThe Gangdese batholith emplaced in southern Tibet in the Cretaceous has been widely regarded as the major component of an Andean-type convergent margin resulting from the northward subduction of the Neo-Tethyan oceanic lithosphere beneath Asia. While the Gangdese batholith consists predominantly of calcalkaline and adackitic ganodiorites, we have recognized a suite of chamockites in the eastern part of the Gangdese belt. They consist of andesine, microcline, enstatite, diopside and Ti-rich biotite, with FeO/(FeO + MgO) ratios of 0. 47 ∼ 0. 50, MALI of - 3. 97 ∼ + 0. 11 , and ASI of 0. 83 ∼ 0. 92, suggesting a typical characteristics of magnesian, alkali-calcic and metaluminous granitic rocks. The estimated temperature and pressure conditions for the crystallization of chamockites are 850 ∼950°C and >0. 4GPa, and the speculated formation depth is below 13 ∼ 15km. Zircons from the chamockites are typical of magmatic origin, and give the weighted mean ages of 87Ma. This demonstrates that the chamockites may have formed in a continental magmatic arc. The presence of chamockites and associated high-temperature granulites in the southern Gangdese indicates that the Gangdese belt has been subjected to an Andean-type orogenic event in the Late Cretaceous.
青藏高原南部白堊紀形成的岡底斯巖基是新特提斯大洋巖石圈向北部的歐亞大陸之下俯沖形成的安第斯型會聚板塊邊緣的重要組成部分。已經有研究證明,岡底斯巖基主要由鈣堿性和埃達克質的花崗閃長巖組成,但本文報道了在岡底斯帶東南緣產出的紫蘇花崗巖。這種巖石主要由中長石、微斜長石、頑火輝石、透輝石、石英、富鈦的黑云母和角閃石組成。在化學成分上,其鐵鎂指數FeO/(FeO+MgO)=0.47~0.50,鈣堿指數MALI為-3.97~+0.11,鋁飽和指數ASI為0.83~0.92,是典型的鎂質、鈣堿性、準鋁質紫蘇花崗巖。計算出的結晶溫度為850~950℃,壓力>0.4GPa,形成深度為13~15km。紫蘇花崗巖中的鋯石為巖漿結晶成因,兩個樣品的U-Pb定年分別給出了87Ma的相同加權平均年齡。巖石學和地球化學特征表明,岡底斯帶南緣晚白堊紀的紫蘇花崗巖形成在典型的大陸巖漿弧環境。紫蘇花崗巖和伴生高溫麻粒巖的存在為岡底斯帶在晚中生代經歷的安第斯型造山作用提供了更加確鑿的證據。
Persistent Identifierhttp://hdl.handle.net/10722/151294
ISSN
2015 Impact Factor: 1.234
2015 SCImago Journal Rankings: 0.892
References

 

DC FieldValueLanguage
dc.contributor.authorZhang, ZMen_US
dc.contributor.authorWang, JLen_US
dc.contributor.authorDong, Xen_US
dc.contributor.authorZhao, GCen_US
dc.contributor.authorYu, Fen_US
dc.contributor.authorWang, Wen_US
dc.contributor.authorLiu, Fen_US
dc.contributor.authorGeng, GSen_US
dc.date.accessioned2012-06-26T06:20:13Z-
dc.date.available2012-06-26T06:20:13Z-
dc.date.issued2009en_US
dc.identifier.citationActa Petrologica Sinica, 2009, v. 25 n. 7, p. 1707-1720en_US
dc.identifier.citation巖石學報, 2009, v. 25 n. 7, p. 1707-1720-
dc.identifier.issn1000-0569en_US
dc.identifier.urihttp://hdl.handle.net/10722/151294-
dc.description.abstractThe Gangdese batholith emplaced in southern Tibet in the Cretaceous has been widely regarded as the major component of an Andean-type convergent margin resulting from the northward subduction of the Neo-Tethyan oceanic lithosphere beneath Asia. While the Gangdese batholith consists predominantly of calcalkaline and adackitic ganodiorites, we have recognized a suite of chamockites in the eastern part of the Gangdese belt. They consist of andesine, microcline, enstatite, diopside and Ti-rich biotite, with FeO/(FeO + MgO) ratios of 0. 47 ∼ 0. 50, MALI of - 3. 97 ∼ + 0. 11 , and ASI of 0. 83 ∼ 0. 92, suggesting a typical characteristics of magnesian, alkali-calcic and metaluminous granitic rocks. The estimated temperature and pressure conditions for the crystallization of chamockites are 850 ∼950°C and >0. 4GPa, and the speculated formation depth is below 13 ∼ 15km. Zircons from the chamockites are typical of magmatic origin, and give the weighted mean ages of 87Ma. This demonstrates that the chamockites may have formed in a continental magmatic arc. The presence of chamockites and associated high-temperature granulites in the southern Gangdese indicates that the Gangdese belt has been subjected to an Andean-type orogenic event in the Late Cretaceous.en_US
dc.description.abstract青藏高原南部白堊紀形成的岡底斯巖基是新特提斯大洋巖石圈向北部的歐亞大陸之下俯沖形成的安第斯型會聚板塊邊緣的重要組成部分。已經有研究證明,岡底斯巖基主要由鈣堿性和埃達克質的花崗閃長巖組成,但本文報道了在岡底斯帶東南緣產出的紫蘇花崗巖。這種巖石主要由中長石、微斜長石、頑火輝石、透輝石、石英、富鈦的黑云母和角閃石組成。在化學成分上,其鐵鎂指數FeO/(FeO+MgO)=0.47~0.50,鈣堿指數MALI為-3.97~+0.11,鋁飽和指數ASI為0.83~0.92,是典型的鎂質、鈣堿性、準鋁質紫蘇花崗巖。計算出的結晶溫度為850~950℃,壓力>0.4GPa,形成深度為13~15km。紫蘇花崗巖中的鋯石為巖漿結晶成因,兩個樣品的U-Pb定年分別給出了87Ma的相同加權平均年齡。巖石學和地球化學特征表明,岡底斯帶南緣晚白堊紀的紫蘇花崗巖形成在典型的大陸巖漿弧環境。紫蘇花崗巖和伴生高溫麻粒巖的存在為岡底斯帶在晚中生代經歷的安第斯型造山作用提供了更加確鑿的證據。-
dc.languagechien_US
dc.publisherScience Press (科學出版社). The Journal's web site is located at http://www.ysxb.ac.cn/ysxb/ch/index.aspxen_US
dc.relation.ispartofActa Petrologica Sinicaen_US
dc.relation.ispartof巖石學報-
dc.subjectAndean-Type Orogen (安第斯型造山作用)en_US
dc.subjectCharnockite (紫蘇花崗巖)en_US
dc.subjectGangdese Batholith (岡底斯巖基)en_US
dc.subjectPetrology (巖石學)en_US
dc.subjectTibet (青藏高原)en_US
dc.subjectZircon U-Pb Dating (鋯石U-Pb定年)en_US
dc.titlePetrology and geochronology of the charnockite from the southern Gangdese belt, Tibet: Evidence for the Andean-type orogenen_US
dc.title青藏高原岡底斯帶南部的紫蘇花崗巖:安第斯型造山作用的證據-
dc.typeArticleen_US
dc.identifier.emailZhao, GC:gzhao@hkucc.hku.hken_US
dc.identifier.authorityZhao, GC=rp00842en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-70350749211en_US
dc.identifier.hkuros175430-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-70350749211&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume25en_US
dc.identifier.issue7en_US
dc.identifier.spage1707en_US
dc.identifier.epage1720en_US
dc.publisher.placeBeijing (北京)en_US
dc.identifier.scopusauthoridZhang, ZM=9939613100en_US
dc.identifier.scopusauthoridWang, JL=9248030900en_US
dc.identifier.scopusauthoridDong, X=38961300600en_US
dc.identifier.scopusauthoridZhao, GC=7403296321en_US
dc.identifier.scopusauthoridYu, F=36702357700en_US
dc.identifier.scopusauthoridWang, W=8626109000en_US
dc.identifier.scopusauthoridLiu, F=36064205800en_US
dc.identifier.scopusauthoridGeng, GS=35184975500en_US
dc.customcontrol.immutablecsl 150223-

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