Characteristics of heavy minerals in modern sediments of Minjiang and Jiulongjiang Rivers,Fujian Province and their provenance implication
Chen Xin-Yi1, Huang Chi-Yue1,2, Shao Lei1
1 State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092; 2 Department of Earth Sciences,National Cheng Kung University, Tainan 701, Taiwan
Abstract：Analyses of this study revealed that the heavy mineral assemblages in the sediments along the Minjiang River and Jiulongjiang River and the rock types in their adjacent provenance areas are highly correlated. The heavy mineral assemblages in drainage areas of Minjiang and Jiulongjiang Rivers are characterized by opaque Fe oxide minerals,epidote,zircon,tourmaline,and hornblende,with epidote accounting for up to 70% among the primary transparent minerals. Except for the reason of high-grade metamorphism of these rocks,the high epidote content is also associated with the contact metamorphic zone between acid granite intrusion and surrounding rocks. According to the analysis of heavy mineral assemblages,provenance-sensitive index,and U-Pb dating of detrital zircon,heavy minerals in the drainage area of Minjiang River were interpreted to be derived from the Precambrian rocks in the Wuyishan Mountain in northwestern Fujian,Yanshannian magmatite and contact metamorphic rocks in eastern Fujian,and heavy minerals in the drainge area of Jiulongjiang River were derived from Indosinian-Yanshanian granite in southwestern Fujian. Sediments in the upper Minjiang River contain heavy minerals characteristic of high-grade metamorphic parent rocks. Heavy minerals in the sediments in the middle and lower Minjiang River are derived from magmatic rocks,contact metamorphic rocks,and from upper reaches of the river. The heavy minerals in Jiulongjiang River are mainly from Indosinian-Yanshanian granite in southwestern Fujian. This research shows that in rivers with small to medium drainage areas,due to the limited transport distance,the provenance information can be largely preserved in the heavy mineral assemblages. Analysis of heavy minerals can therefore yield crucial information for reconstructions of tectonic evolution and source-to-sink analysis.
Chen Xin-Yi,Huang Chi-Yue,Shao Lei. Characteristics of heavy minerals in modern sediments of Minjiang and Jiulongjiang Rivers,Fujian Province and their provenance implication[J]. JOPC, 2018, 20(4): 637-650.
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