拉萨地块北部白垩纪多尼组火山岩的地球化学: 形成的构造环境

康志强; 许继峰; 王保弟; 董彦辉; 王树庆; 陈建林

Volume 34 Issue 1

Jan. 2009

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Article Navigation > Earth Science > 2009 > 34(1): 89-104

KANG Zhi-qiang, XU Ji-feng, WANG Bao-di, DONG Yan-hui, WANG Shu-qing, CHEN Jian-lin, 2009. Geochemistry of Cretaceous Volcanic Rocks of Duoni Formation in Northern Lhasa Block: Discussion of Tectonic Setting. Earth Science, 34(1): 89-104.

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Geochemistry of Cretaceous Volcanic Rocks of Duoni Formation in Northern Lhasa Block: Discussion of Tectonic Setting

KANG Zhi-qiang^{1, 2},
XU Ji-feng^{1
,
,},
WANG Bao-di^{1, 2},
DONG Yan-hui^{1, 2},
WANG Shu-qing^{1, 2},
CHEN Jian-lin^{1, 2}

1.
Key Laboratory of Isotope Geochronology and Gechemistry, Guangzhou Institute of Geachemistry, Chinese Academy of Sciences Guangzhou 510640, China
2.
Graduate School of Chinese A cademy of Sciences, Beijing 100039, China

Received Date: 2008-10-21
Publish Date: 2009-01-25

Abstract

Abstract

It can better understand the geological evolution of the Tethys and construction of the whole Tibet plateau through studying Mesozoic volcanic rocks widely exposed in Lhasa block.In present study, we report new major trace of elemental compositions and zircon U-Pb dating results of the Duoni Formation volcanic rocks in north Lhasa block.Duoni Formation volcanic rocks in Daguo and Mayuexiang areas mainly contain acid rocks and a few basalts, andesitic-basalts (intermediate-basic group).The intermediate-basic rocks with high Cr (184×10^-6 in average) and Ni (43×10^-6 in average), showing geochemical characteristics similar to the volcanic rocks that in arcs or active continental margins, such as LILE's enrichment and HFSE's depletion, which thought to be the melting products of continental marginal mantle wedge below a thickened crust due to southward subduction of the Bangongco-Nujiang ocean.The acid rocks have relatively high SiO₂, K₂O, K₂O/Na₂O and very low Mg^# (the maxim is 32.4), enrich in Rb, Ba, Th, U and LREE, high Rb/Sr (1.06-4.47, the average is 2.73), and have spidergram patterns similar to the acid rocks of the Linzizong Group derived from a crust source.Thus, the acid rocks in Duoni Formation were came from a magmatic source different from those of the intermediate-basic rocks.Zircons from two acid rocks in Duoni Formation were dated by LA-ICPMS, obtaining age of 116±1Ma and 115±1Ma, respectively.We suggest that there are probably two possibilities for the formation tectonic setting of Duoni Formation: the southward subduction of the Bangongco-Nujiang ocean, or the tectonic extension in Early-Cretaceous in the Lhasa terrane.
- Lhasa block,
- Duoni Formation,
- Early Cretaceous,
- Bangongco-Nujiang Ocean,
- geochemistry

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References(88)

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Geochemistry of Cretaceous Volcanic Rocks of Duoni Formation in Northern Lhasa Block: Discussion of Tectonic Setting

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