藏南冈底斯南缘程巴岩体高Sr/Y花岗闪长岩和包体形成机制及Sr-Nd-Hf同位素制约
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摘要
程巴岩体位于藏南冈底斯岩基东段南缘,由花岗闪长岩、细粒闪长质包体等组成。测得的锆石U-Pb年龄可以代表岩石的形成年龄,即花岗闪长岩形成年龄为29.40±0.18Ma与29.42±0.25Ma,细粒闪长质捕虏体形成年龄为30.02±0.15Ma。花岗闪长岩具有较高的Si O2(65.2%~66.2%)、K2O(3.2%~4.0%),较低的铁(TFe O=3.2%~4.0%)和Mg O(约2%),同时具有高Sr(774×10-6~813×10-6)、低Y(9.9×10-6~11.2×10-6)、高Sr/Y值(63.4~82.2)等特征;闪长质包体表现出较低的Si O2(53%~56.1%)和K2O(1.5%~3.2%),较高的铁(TFe O=6.1%~8.1%)、Mg O(4.0%~6.2%)和Na2O/K2O≥2,同时具有负Eu异常(Eu/Eu*=0.432~0.804)。2种岩性都富集LREE及LILE,亏损HREE及HFSE,具有较高且一致的εHf(t)值(+1.1~+6.2)和全岩εNd(t)值(-2.9~-5.9)。以上数据表明,花岗闪长岩与细粒闪长质包体由同一岩浆分离结晶形成,花岗闪长岩经历磷灰石和角闪石的分离结晶,其高Sr/Y值为岩浆分离结晶的结果,并不代表原始岩浆组分。
The Chengba Complex on the southern margin of the Gangdise batholiths in southern Tibet comprises mainly granodiorite and subordinately dioritic enclaves and leucogabbro. Zircon U-Pb analytical results demonstrate that the granodiorites formed at29.40±0.18 Ma to 29.42±0.25 Ma, whereas the fine-grained dioritic enclaves formed at 30.02±0.15 Ma. Bulk-rock major and trace element and isotope(Sr-Nd-Hf) analyses indicate that the granodiorites are characterized by relatively high Si O2(65.2%~66.2%) andK2O(3.2%~4.0%) but low Fe O and Mg O, and high Sr(774×10-6~813×10-6), low Y(9.9×10-6~11.2×10-6), and hence high Sr/Y ratios(>60 and up to 82). In contrast, the dioritic enclaves are relatively low in Si O2(53%~56.1%) and K2O(1.5%~3.2%), but high in Mg O and Fe O with relatively high Na/K ratios(≥2). Both are enriched in LREE and LILE and depleted in HREE and HFSE and have similar relatively high zircon εHf(t) values(+1.1~+6.2)as well as negative whole-rock εNd(t) values(-2.9~-5.9). Combined with data available, the new results obtained by the authors suggest that the Chengba granodiorite and dioritic enclaves were formed within a time span of ca.1Ma. Similar isotopic characteristics imply that they were derived from similar sources. The high Sr/Y ratios in Chengba granodiorite, in contrast to low Sr/Y ratios in the mafic enclaves, possibly do not represent primary magma composition.Instead, the high Sr/Y and high Ba characteristics of the Chengba granodiorite might have resulted from fractional crystallization of parent magmas with low Sr/Y ratios and low Ba content like those mafic enclaves.
The Chengba Complex on the southern margin of the Gangdise batholiths in southern Tibet comprises mainly granodiorite and subordinately dioritic enclaves and leucogabbro. Zircon U-Pb analytical results demonstrate that the granodiorites formed at29.40±0.18 Ma to 29.42±0.25 Ma, whereas the fine-grained dioritic enclaves formed at 30.02±0.15 Ma. Bulk-rock major and trace element and isotope(Sr-Nd-Hf) analyses indicate that the granodiorites are characterized by relatively high Si O2(65.2%~66.2%) andK2O(3.2%~4.0%) but low Fe O and Mg O, and high Sr(774×10-6~813×10-6), low Y(9.9×10-6~11.2×10-6), and hence high Sr/Y ratios(>60 and up to 82). In contrast, the dioritic enclaves are relatively low in Si O2(53%~56.1%) and K2O(1.5%~3.2%), but high in Mg O and Fe O with relatively high Na/K ratios(≥2). Both are enriched in LREE and LILE and depleted in HREE and HFSE and have similar relatively high zircon εHf(t) values(+1.1~+6.2)as well as negative whole-rock εNd(t) values(-2.9~-5.9). Combined with data available, the new results obtained by the authors suggest that the Chengba granodiorite and dioritic enclaves were formed within a time span of ca.1Ma. Similar isotopic characteristics imply that they were derived from similar sources. The high Sr/Y ratios in Chengba granodiorite, in contrast to low Sr/Y ratios in the mafic enclaves, possibly do not represent primary magma composition.Instead, the high Sr/Y and high Ba characteristics of the Chengba granodiorite might have resulted from fractional crystallization of parent magmas with low Sr/Y ratios and low Ba content like those mafic enclaves.
引文
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