Study on the Metallogenetism of Sub-mantle Plume and Mantle Branches in the Gold Mineralization Concentration Area of Northwest Jiaodong Peninsula

Abstract

The northwest of Jiaodong peninsula is characterized by its greatest gold concentration area, enormous gold reserves and limited time interval (115±5Ma) of gold mineralization in China. Studies show that the east area of north China began its mantle plume evolution since the Yanshanian movement, and the Laiyang sub‐mantle plume and its surrounding mantle branches such as those in Guojiadian, Aishan and Panshidian were formed in the mineralization concentration area of northwestern Jiaodong peninsula. With the development of mantle plume → sub‐mantle plume → mantle branch → favorable expending structures, the deep‐derived hydrothermal fluid moved up to the favorable places, such as brittle‐ductile or ductile‐brittle shearing zones, the internal and external contact zones of intrusions, dense fracturing zones and the contact zones between dikes and countryrocks, and concentrated into deposits. Then the gold mineralization concentration zones that are centralized on mantle branches were formed. This study takes Guojiadian mantle branch as an example to discuss their metallogenetism and conclude the metallogenetic mode.

Petrogenesis of the Weideshan Pluton in Jiaodong and Its Implications for Gold Polymetallic Mineralization: Constraints from Zircon U-Pb-Hf Isotopes, Petrogeochemistry, and Whole-Rock Sr-Nd Isotopes

“…Previous studies on the metallogenic age of Cu-Mo-Pb-Zn deposits in Jiaodong showed that the mineralization ages were concentrated at 120-110 Ma [24,25,33,83], similar to the mineralization age of the Jiaodong Au deposits. The formation age of the Weideshan pluton obtained in this study was 112 Ma, which was consistent with the previous research results (123-110 Ma) of Weideshan granites [26,27,32,40,[54][55][56]. This showed that large-scale magmatism and mineralization occurred in the Jiaodong area at the same time and highlighted that the Au and Cu-Mo-Pb-Zn polymetallic mineralization in the Jiaodong area was associated with the Weideshan granites.…”

“…Previous studies of Weideshan granite in the Jiaodong area have obtained ages of 123-110 Ma, with a peak value of 120 Ma [26,27,32,40,[54][55][56]. The crystallization ages of plutons in the Jiaobei area are Nansu (118.7 ± 0.9 Ma) [27], Ai Shan (118.0 ± 0.7 Ma) [9], and Yashan (117.7 ± 2.9 Ma) [27], and the ages of plutons in the Weihai uplift area are Zetou (115.6 ± 1.1 Ma) [26] and Weideshan (113.1 ± 1.1 Ma) [27] from west to east.…”

The Thermal and Dynamic Process of Core → Mantle → Crust and the Metallogenesis of Guojiadian Mantle Branch in Northwestern Jiaodong

“…But it is obvious that the scale of a mantle plume is too large for explaining the formation process of a specific deposit or ore field. The mantle branch structure which was first put forward by Professor Niu in 1996 [80][81][82][83][84][85], is the third grade of structural units during multiple evolutions of mantle plumes and is mainly used to research ore-forming and the ore-controlling role of Au-Ag polymetallic ore fields. So, in this paper, the metallogenesis of gold deposits in the Northwest of Jiaodong are discussed from the perspective of a mantle branch structure.…”