The palaeozoic deep water sedimentary belt along the northern margin of the Yunkai Block also extends to the northeastern coast area of Vietnam.
地块北缘的古生代深水沉积带，也延展到越南东北沿海地区。
The Yunkai Block, extended in southern Guangxi and western Guangdong, is located in the intersection area of the Tethyan and the circum Pacific tectonic zones.
桂南—粤西的云开地块，位于特提斯构造带和环太平洋构造带的交汇处。
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