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题名: Late Paleozoic Woniusi basaltic province from Sibumasu terrane: Implications for the breakup of eastern Gondwana's northern margin
作者: Liao, Shi-Yong1, 2; Wang, Dong-Bing1; Tang, Yuan1; Yin, Fu-Guang1; Cao, Shu-Nan3; Wang, Li-Quan1; Wang, Bao-Di1; Sun, Zhi-Ming1
刊名: GEOLOGICAL SOCIETY OF AMERICA BULLETIN
出版日期: 2015-09-01
卷号: 127, 期号:9-10, 页码:1313-1330
学科分类: 天文和天体物理
DOI: 10.1130/B31210.1
文章类型: Article
英文摘要: The tectonic mechanism responsible for detachment of the Sibumasu terrane in the eastern Cimmerian continent from the Australian Gondwana margin remains poorly understood and debated. Our study on the late Paleozoic Woniusi basaltic province in the northern Sibumasu terrane may provide a new perspective on this problem, and further, on the rifting dynamics of eastern Gondwana's northern margin. In this study, we revealed that the Woniusi basaltic province is spread over an area of similar to 12,000 km(2) with a thickness of similar to 300-500 m for the eruptive phase. Direct zircon U-Pb dating of mafic dikes indicates that the Woniusi basaltic province was emplaced between the latest Carboniferous and late Early Permian (301 Ma to 282 Ma), synchronous with basaltic rocks from the Panjal Traps, Tethyan Himalaya (Bhote Kosi, Selong, Abor), Lhasa, and southern Qiangtang. Geochemically, the Woniusi basaltic rocks show subalkaline tholeiitic affinity and relatively homogeneous features of enriched light rare earth elements (LREEs) and large ion lithophile elements (LILEs) but depleted Nb and Ta patterns. They were most likely derived from an enriched subcontinental lithospheric mantle source and triggered by the mantle plume-induced rifting process. The Woniusi basaltic province, together with other coeval basaltic provinces from the Panjal Traps, Tethyan Hima-laya, Lhasa, and southern Qiangtang, belongs to a fragmented large igneous province that may have had an original area of over 2 x 10(6) km(2), which is comparable to that of the Ontong-Java, Deccan, or Siberian Traps. These Tethyan basaltic provinces share a common mantle plume centered in northern Greater India. It was this mantle plume that may have triggered the initial rifting of the eastern Cimmerian terranes (e.g., Sibumasu, southern Qiangtang) from both the northern Indian and Australian Gondwana margins, as well as the opening of Meso-Tethys Ocean. This study, moreover, sheds light on the paleopositions of the Lhasa and Tengchong terranes before their breakups.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Geosciences, Multidisciplinary
研究领域[WOS]: Geology
关键词[WOS]: LARGE IGNEOUS PROVINCES ; MESOZOIC PALAEOTETHYAN EVOLUTION ; CONTINENTAL FLOOD BASALTS ; HF ISOTOPIC COMPOSITIONS ; VOLCANIC RIFTED MARGINS ; PLATE TECTONIC MODEL ; U-PB GEOCHRONOLOGY ; SW CHINA ; SOUTHWEST CHINA ; WESTERN YUNNAN
收录类别: SCI
所属项目名称: PMO_LIB-IR
语种: 英语
WOS记录号: WOS:000360559100009
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/14908
Appears in Collections:行星科学与深空探测实验室_期刊论文
太阳活动的多波段观测研究团组_期刊论文

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作者单位: 1.Chengdu Inst Geol & Mineral Resources, Chengdu 610082, Peoples R China
2.Chinese Acad Sci, Key Lab Planetary Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
3.Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China

Recommended Citation:
Liao SY,Wang DB,Tang Y,et al. Late Paleozoic Woniusi basaltic province from Sibumasu terrane: Implications for the breakup of eastern Gondwana's northern margin[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2015,127(42257):1313-1330.
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