کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4730974 1640395 2013 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Paleomagnetism of the late Cryogenian Nantuo Formation and paleogeographic implications for the South China Block
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
پیش نمایش صفحه اول مقاله
Paleomagnetism of the late Cryogenian Nantuo Formation and paleogeographic implications for the South China Block
چکیده انگلیسی

A new paleomagnetic pole position is obtained from the well-dated (636.3 ± 4.9 Ma) Nantuo Formation in the Guzhang section, western Hunan Province, and the correlative Long’e section in eastern Guizhou Province, South China. Remagnetization of the recent geomagnetic field was identified and removed for both sections. The hard dual-polarity, interpreted as primary, component of the Nantuo Formation, directs east–westward with medium inclinations, yielding an average pole of 9.3°N, 165°E, A95 = 4.3° that, for the first time, passed a strata-bound reversals test. The new data are consistent with previously published paleomagnetic data of the Nantuo Formation from Malong county, central Yunnan Province, which passed a positive syn-sedimentary fold test. Together, these sites represent shallow- to deep-water sections across a shelf-to-basin transect centered at ∼33° paleolatitude. The sedimentary basin may have faced an expansive ocean toward the paleo-East. In the ∼750 Ma and ∼635 Ma global reconstructions, the South China Block (SCB) was best fitted in the northern hemisphere close to northwestern Australia. However, a direct SCB-northwestern Australia connection, inferred to have existed during the Early Cambrian–Early Devonian, had not formed by the time of ∼635 Ma.


► We report a new high quality paleomagnetic pole for Nantuo Formation.
► We proposed a new hypothesis for the SCB-NW Australia connection.
► We depicted the Chinese blocks in the global context at ∼750 Ma and 635 Ma.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Asian Earth Sciences - Volume 72, 10 August 2013, Pages 164–177
نویسندگان
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