Abstract
The Qinzhou Bay-Hangzhou Bay joint belt is a significant tectonic zone between the Yangtze and Cathaysian plates, where plentiful hydrothermal siliceous rocks are generated. Here, the authors studied the distribution of the siliceous rocks in the whole tectonic zone, which indicated that the tensional setting was facilitating the development of siliceous rocks of hydrothermal genesis. According to the geochemical characteristics, the Neopalaeozoic siliceous rocks in the north segment of the Qinzhou Bay-Hangzhou Bay joint belt denoted its limited width. In comparison, the Neopalaeozoic Qinzhou Bay-Hangzhou Bay joint belt was diverse for its ocean basin in the different segments and possibly had subduction only in the south segment. The ocean basin of the north and middle segments was limited in its width without subduction and possibly existed as a rift trough that was unable to resist the terrigenous input. In the north segment of the Qinzhou Bay-Hangzhou Bay joint belt, the strata of hydrothermal siliceous rocks in Dongxiang copper-polymetallic ore deposit exhibited alternative cycles with the marine volcanic rocks, volcanic tuff, and metal sulphide. These sedimentary systems were formed in different circumstances, whose alternative cycles indicated the release of internal energy in several cycles gradually from strong to weak.
Highlights
The Qinzhou Bay-Hangzhou Bay joint belt (QHJB), located between the Yangtze and Cathaysian plates, has attracted much attention because of its interesting tectonic properties
Siliceous rocks in the Dongxiang area originated from hydrothermal sedimentation, as is strongly supported by both microfabric and geochemical characteristics
The siliceous SiO2 content ranges from 77.13% to 87.80%, which is in agreement with hydrothermal genesis
Summary
The Qinzhou Bay-Hangzhou Bay joint belt (QHJB), located between the Yangtze and Cathaysian plates, has attracted much attention because of its interesting tectonic properties. The Neopalaeozoic ophiolitic melange in northeast Jiangxi province possibly indicates the Qinzhou-Hangzhou tectonic zone to be the eastern part of the Neopalaeozoic Tethys ocean [28], and the early Mesozoic acid volcanic rocks of the south segment in southwest Guangxi province confirm the subduction of an ocean basin until the middle Triassic period [35]. The Qin-Fang trough has been attested in the south segment [40, 41], but there is a lack of orogenic properties because of the absence of a homochronous ophiolite suite and volcanic rocks in the middle and north segments [31] This indicates that the Neopalaeozoic tectonic properties for the entire QHJB remain somewhat unclear, and the orogenic properties may not possibly run throughout the whole QHJB with subduction in the ocean basin. These analyses aided in understanding the geological characteristics and associated indications
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