Feng C.,Chinese Academy of Geological Sciences |
Zeng Z.,South Jiangxi Geological Survey Party |
Liu J.,South Jiangxi Geological Survey Party |
Li H.,South Jiangxi Geological Survey Party
Yanshi Xuebao/Acta Petrologica Sinica | Year: 2015
The Xingguo-Ningdu ore cluster in southern Jiangxi Province, located in the convergent zone of the eastern Nanling EW-trending metallogenic belt and the western Wuyishan NE-trending metallogenic belt, possess several different type of W-Sn polymetallic deposits. However, little research has been done for these deposits. Based on detailed field investigations, high-precision isotope dating on the Zhangjiadi Mo-W deposit, the time-space distribution of W-Sn ore deposits in Cathaysia Block and their geodynamic settings are studied in this paper. SHRIMP zircon U-Pb age for porphyritic fine to medium-grained biotite granite from the Zhangjiadi ore deposit is 154.1 ± 1.8Ma. Molybdenites separated from the quartz vein type orebody in the Wangnipai ore block and the greisen orebody in the Liujiazhuang ore block yield Re-Os isochron ages of 158.4 ± 3.1Ma (weighted mean age 157.7 ± 1.4Ma) and 161.9 ± 3.2Ma (weighted mean age 157.9 ± 1.6Ma), respectively, which are corresponding to Late Jurassic period. The studied molybdenites show quite low Re contents (9.58 × 106 - 22.65 × 106), suggesting a continental crustal source of the ore metals. Integrated with the latest research results, it is concluded that the W-Sn deposits formed during 240-210Ma, 170-150Ma and 130-90Ma, and are centered by the largest scale in southern Jiangxi Province and southern Hunan Province, and become younger in the east, west, south and north directions. We suggest that the Yanshanian large-scale magmatic and ore-forming processes may have occurred in a Jurassic intraplate extensional geodynamic setting during the Mesozoic lithosphere extension in South China. © 2015, Science Press. All rights reserved.
Liu S.-B.,Chinese Academy of Geological Sciences |
Chen Y.-C.,Chinese Academy of Geological Sciences |
Fan S.-X.,South Jiangxi Geological Survey Party |
Xu J.-X.,Land Office of Jiangxi Province |
Ying L.-J.,Chinese Academy of Geological Sciences
Geology in China | Year: 2010
A study of Re-Os isotopic chronology of molybdenite suggests that the metallogenic age of the Anqiantan tungsten ore deposit in south Jiangxi area within eastern Nanling region is about 156 Ma and that of the Yuanlingzhai molybdenum ore deposit is about 160Ma. Statistics indicate that there occurred 3 epochs comprising 6 stages of mineralization during Mesozoic in the eastern and central parts of the Nanling metallogenic belt. These stages are about 225 Ma and 195 Ma of Indo-Chinese period, 170-160 Ma, 160-150 Ma and 150-145Ma of Early Yanshanian period, and about 135 Ma and 100 Ma of Late Yanshanian period. The mineralization during Early Yanshanian period is the strongest one, so that Early Yanshanian is the major metallogenic period for tungsten and tin ore deposits in the eastern and central parts of the Nanling metallogenic belt. There exist independent W-Sn polymetallic ore deposits, Sn ore deposits, Cu-Pb-Zn polymetallic ore deposits and Mo ore deposits. Combined with an analysis of metallogenic chronology, the authors hold that there might exist undiscovered or neglected mineral resources in the horizontal direction as well as metallogenic potential at the depth of the known ore deposits in the vertical direction. This study has provided theoretic basis for geological prospecting in the second space of the eastern and central parts of the Nanling metallogenic belt.
Geophysical investigations of the geology and structure of the Pangushan-Tieshanlong tungsten ore field, South Jiangxi, China-Evidence for site-selection of the 2000-m Nanling Scientific Drilling Project (SP-NLSD-2)
Fang G.,Guilin University of Technology |
Chen Z.,Chinese Academy of Geological Sciences |
Chen Y.,Chinese Academy of Geological Sciences |
Li J.,Shanxi Geophysics and Geochemical Prospecting Institute |
And 4 more authors.
Journal of Asian Earth Sciences | Year: 2015
The Pangushan-Tieshanlong tungsten ore field, located in the center of southern Jiangxi Province, eastern Nanling region, contains many granitic plutons, both exposed and concealed, and hosts numerous tungsten-polymetallic ore deposits. Despite many previous geological studies, the deep geology and structure of the field are poorly known because few geophysical measurements have been undertaken. In this study, we carried out a variety of geophysical measurements, including gravity, magnetic field detection, magnetotelluric sounding (MT) and high-resolution seismic reflection to better outline the nature of the ore field and to aid in site selection for the 2000-m Nanling Scientific Drilling Project (SP-NLSD-2), to be carried out by the Chinese SinoProbe Program. Four granitic intrusives, the Tangcun, Pangushan, Huangsha and Bai'e plutons, crop out independently at the surface but were found to be parts of a large batholith at depth. The Tangcun composite pluton, which at the surface consists chiefly of Caledonian granite and minor Early Yanshanian intrusive material, was found to be chiefly Early Yanshanian granite concealed beneath the lower part of the Caledonian granite. The Bai'e pluton initially decreases in size with depth and then expands as it merges with the major batholith. The Pangushan and Huangsha plutons are domes on the inferred batholith. Four granitic magma channels and a considerable number of faults have been identified. Due to its favorable geological conditions, the top of the Pangushan pluton is predicted to be the best candidate for ore prospecting. It is basically a granite cupola with many cross-cutting and parallel faults. In addition, it is characterized by a high gravity anomaly, a high magnetic anomaly and locally a low electrical resistivity anomaly. © 2015 Elsevier Ltd.
Huang F.,Chinese Academy of Geological Sciences |
Wang D.,Chinese Academy of Geological Sciences |
Santosh M.,China University of Geosciences |
Wang C.,Chinese Academy of Geological Sciences |
And 4 more authors.
Journal of Asian Earth Sciences | Year: 2014
The newly discovered Yuanlingzhai porphyry molybdenum (Mo) deposit in southern Jiangxi province belongs to the group of Mo-only deposits in the Nanling region. The mineralization developed at contact zones between the Yuanlingzhai granite porphyry and Neoproterozoic metamorphic rocks of the Xunwu Formation. Precise LA-MC-ICPMS zircon U-Pb dating of the Yuanlingzhai porphyry, as well as the adjacent western Keshubei and eastern Keshubei granites, yielded ages of 165.49±0.59Ma, 159.68±0.43Ma, and 185.13±0.52-195.14±0.63Ma, respectively. Molybdenite Re-Os isochron ages of the ores are 160±1-162.7±1.1Ma, which is consistent with the age of large-scale W-Sn deposits in South China. The Yuanlingzhai porphyry is characterized by high K2O, P2O5, and A/CNK (1.33-1.59), and low CaO and Na2O. The rock shows relatively enriched LREE without significant Eu anomalies (Eu/Eu*=0.80-0.90). Geochemical and mineralogical characteristics indicate that the ore-hosting porphyry is a typical S-type granite generated from the partial melting of crustal material with only minor mantle contribution. Both Harker and evolutionary discrimination diagrams indicate that the Yuanlangzhai and western Keshubei granites are not products of co-magmatic evolution. The Keshubei granites and Xunwu Formation were not significant sources for the components in the porphyry mineralization, but the Yuanlangzhai granite may have supplied some ore-forming material. However, the main ore-forming material was carried by fluids from deep sources, as demonstrated by fluid inclusion and stable isotope data from the molybdenum deposit. The Mo porphyry deposit formed in an extensional setting, and was possibly associated with Jurassic subduction of the Izanagi Plate. © 2013 Elsevier Ltd.