The Cenozoic tectono-magmatism-mineralization effect of the intracontinental tectonic transformation system in the western margin of Yangtze Block

doi:10.13745/j.esf.sf.2020.3.16

Abstract

Abstract:

The Tethys tectonic domain, which extends from east to west across Eurasia, contains one of the most important precious/base metallogenic belts. The belt turns toward the southeast after reaching the Yangtze Block and series of large to giant Cu-Au deposits have recently been discovered at this hinge zone. It has previously been determined that the large-scale Jinshajiang-Honghe strike-slip fault along the western Yangtze margin cut through the lithosphere, inducing magmatic intrusions and forming an alkali-rich porphyry belt. In this study, several alkali-rich intrusions (including Laojunshan in Jianchuan, Beiya in Heqing, Laojiezi-Gangou in Yao’an, Yuzhila in Dayao, and Zhiju in Yongren) were analysed for tectonic stress. The results show that in addition to the distribution of alkali-rich porphyries along both sides of the Jinshajiang-Honghe Fault, there are also many dykes along the E-W-trending structures within the interior of the Yangtze Block. These intrusions have magmatic and mineralization ages ranging from 36.87-30.70 Ma, coeval with the formation of the porphyry belt. It was found that the magmatic ages become younger and alkalinity increases from west to east, defining an eastward magmatic migration. Field observations and statistical analyses of these nearly E-W-trending dykes and joints revealed that the structures controlling magmatism have undergone E-W compression and N-S extension, which is compatible with the large NW-trending strike-slip structures observed. Based on these lines of evidence, the formation of a series of alkali-rich intrusions within the Yangtze Block is likely related to the large-scale NW-trending strike-slip structures. The alkali-rich intrusions and related Cu-Au porphyry mineralization are distributed in the N-S- and E-W-trending secondary structures from west to east, and magmatism and mineralization were coupled with intracontinental structural transformations.

Key words: western margin of Yangtze Block, Cenozoic, intracontinental tectonic transformation system, alkali-rich porphyry, metallogenic effect

CLC Number:

LI Wenchang, JIANG Xiaojun. The Cenozoic tectono-magmatism-mineralization effect of the intracontinental tectonic transformation system in the western margin of Yangtze Block[J]. Earth Science Frontiers, 2020, 27(2): 151-164.

Figures/Tables 11

Fig.1 Alkali-rich porphyry belt(deposit)and age of Jinshajiang-Honghe strike-slip fault. Modified from [18].

Table 1 Zircon U-Pb age and sampling location of Cenozoic alkali-rich porphyry dike near EW direction in western margin of Yangtze Block

Fig.2 LA-ICP-MS U-Pb concordia diagram for zircon of Cenozoic alkaline-rich porphyry dike along EW direction from western margin of Yangtze Block

Fig.3 Geological sketch of Pb-Ag deposit in Laojiezi and Au deposit in Gangou(a) and Cenozoic alkali-rich porphyry dike along EW direction(b) in Yao’an in the western margin of Yangtze Block

Fig.4 Geological sketch of Zhiju Cu-Mo deposits in Yongren(a) and Cenozoic alkali-rich porphyry dike along EW direction(b) in western margin of Yangtze Block

Fig.5 Sketch of Cenozoic alkali-rich porphyry dike near EW direction in western margin of Yangtze Block

Fig.6 Iso-intensity diagram(a)and tectonic stress field analysis(b)for alkali-rich porphyry dike along EW direction and various fracture structures of Cenozoic intracontinental tectonic transformation system in western margin of Yangtze Block

Fig.7 Distribution diagram of NW and EW direction alkali-rich porphyry and related deposits for Cenozoic intracontinental tectonic transformation system in western margin of Yangtze Block

Fig.8 Contrast histogram of magmatism and mineralization age on NW and EW direction alkali-rich porphyry dike of Cenozoic intracontinental tectonic transformation system in western margin of Yangtze Block

Fig.9 Tectono-magmatism-mineralization conceptual model of Cenozoic intracontinental tectonic transformation system in western margin of Yangtze Block. Modified from [18,65].

Fig.10 Model map of Cenozoic intracontinental tectonic transformation system and its magmatic metallogenetic effect in western margin of Yangtze Block

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