scholarly journals Geostatistical Determination of Ore Shoot Plunge and Structural Control of the Sizhuang World-Class Epizonal Orogenic Gold Deposit, Jiaodong Peninsula, China

Minerals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 214 ◽  
Author(s):  
Si-Rui Wang ◽  
Li-Qiang Yang ◽  
Jian-Gang Wang ◽  
En-Jing Wang ◽  
Yong-Lin Xu
Keyword(s):  
Gold Deposit ◽  
Structural Control ◽  
Large Scale ◽  
Early Stage ◽  
Eastern China ◽  
Mining Area ◽  
Orogenic Gold ◽  
Forming Process ◽  
Jiaodong Peninsula ◽  
Variogram Modeling

The Jiaodong Peninsula in eastern China is the third largest gold-mining area and one of the most important orogenic gold provinces in the world. Ore shoots plunging in specific orientations are a ubiquitous feature of the Jiaodong lode deposits. The Sizhuang gold deposit, located in northwestern Jiaodong, is characterized by orebodies of different occurrences. The orientation of ore shoots has remained unresolved for a long time. In this paper, geostatistical tools were used to determine the plunge and structural control of ore shoots in the Sizhuang deposit. The ellipses determined by variogram modeling reveal the anisotropy of mineralization, plus the shape, size, and orientation of individual ore shoots. The long axes of the anisotropy ellipses trend NE or SEE and plunge 48° NE down the dip. However, individual ore shoots plunge almost perpendicular to the plunge of the ore deposit as a whole. This geometry is interpreted to have resulted from two periods of fluid flow parallel to two sets of striations that we identified on ore-controlling faults. Thrust-related lineations with a sinistral strike-slip component were associated with early-stage mineralization. This was overprinted by dextral and normal movement of the ore-controlling fault that controlled the late-stage mineralization. This kinematic switch caused a change in the upflow direction of ore-forming fluid, which in turn controlled the orientation of the large-scale orebodies and the subvertical plunge of individual ore shoots. Thus, a regional transition from NW-to-SE-trending compression to NW-to-SE-trending extension is interpreted as the geodynamic background of the ore-forming process. This research exemplifies an effective exploration strategy for studying the structural control of the geometry, orientation, and grade distribution of orebodies via the integration of geostatistical tools and structural analysis.

Anatomy of a world-class epizonal orogenic-gold system: A holistic thermochronological analysis of the Xincheng gold deposit, Jiaodong Peninsula, eastern China

2019 ◽  
Vol 70 ◽  
pp. 50-70 ◽  
Author(s):  
Liang Zhang ◽  
Li-Qiang Yang ◽  
Roberto F. Weinberg ◽  
David I. Groves ◽  
Zhong-Liang Wang ◽  
...  
Keyword(s):  
Gold Deposit ◽  
Eastern China ◽  
Orogenic Gold ◽  
System A ◽  
Jiaodong Peninsula ◽  
World Class

Thermochronologic constrains on the processes of formation and exhumation of the Xinli orogenic gold deposit, Jiaodong Peninsula, eastern China

2017 ◽  
Vol 81 ◽  
pp. 140-153 ◽  
Author(s):  
Liang Zhang ◽  
Li-Qiang Yang ◽  
Yu Wang ◽  
Roberto F. Weinberg ◽  
Ping An ◽  
...  
Keyword(s):  
Gold Deposit ◽  
Eastern China ◽  
Orogenic Gold ◽  
Orogenic Gold Deposit ◽  
Jiaodong Peninsula

Formation of the Liaoshang gold deposit, Jiaodong Peninsula, eastern China: Evidence from geochronology and geochemistry

2020 ◽  
Vol 55 (8) ◽  
pp. 5903-5913 ◽  
Author(s):  
Junjian Li ◽  
Pengpeng Zhang ◽  
Guohua Li ◽  
Wengang Liu ◽  
Zhelin Zhao ◽  
...  
Keyword(s):  
Gold Deposit ◽  
Eastern China ◽  
Jiaodong Peninsula

scholarly journals A Geological-Geophysical Prospecting Model for Deep-Seated Gold Deposits in the Jiaodong Peninsula, China

Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1393
Author(s):  
Mingchun Song ◽  
Guoqiang Xue ◽  
Hongbo Liu ◽  
Yixin Li ◽  
Chunyan He ◽  
...  
Keyword(s):  
Large Scale ◽  
Fault Location ◽  
Geophysical Methods ◽  
Mining Area ◽  
Geological Structure ◽  
Gold Deposits ◽  
Geophysical Prospecting ◽  
Metallogenic Model ◽  
Jiaodong Peninsula ◽  
Frequency Domain Methods

The North China Craton is one of China’s major gold-producing areas. Breakthroughs have been continually made in deep prospecting at depths of 500–2000 m in the Jiaodong Peninsula, and geophysical methods have played an important role. Given that the geophysical signals of deep-seated gold deposits are difficult to detect, due to their thick overburden layers, conventional geophysical methods are not suitable for deep prospecting. Therefore, this study upgrades the geological-geophysical prospecting model, which is based on the deep metallogenic model and geophysical method of large exploration depths. Based on the analysis of the metallogenic geological factors of the altered-rock-type gold deposits in the fracture zones of the Jiaodong Peninsula, this study proposes that the gold deposits are controlled by large-scale faults, generally occur near the contact interfaces between the Early Precambrian metamorphic rock series and Mesozoic granitoids, and exhibit a stepped metallogenic model. This model then becomes the prerequisite and basic condition for deep prospecting by geophysical methods. For this reason, the traditional geophysical model, which focuses on the exploration of shallow mineralization anomalies, is transformed into a comprehensive multi-parameter geological-geophysical qualitative prospecting model highlighting the exploration of ore-controlling structural planes. The model adopts various frequency domain methods (e.g., CSAMT, AMT, WFEM), reflection seismology, and other methods to detect the deep geological structure. The characteristics of parameters such as gravity and magnetism, resistivity, polarizability, and the seismic reflection spectrum are applied to identify the ore-controlling fault location and dip angle change, and to estimate the ore-bearing location according to the stepped metallogenic model. The prospecting demonstration of deep-seated gold deposits in the Shuiwangzhuang mining area indicates the effectiveness of the comprehensive model. The comprehensive deep prospecting model effectively solves the problem of deep prospecting of gold deposits controlled by faults, promotes the great breakthrough of deep prospecting in the Jiaodong Peninsula, and provides an important technology demonstration for deep prospecting throughout China.

scholarly journals Genesis of the Koka Gold Deposit in Northwest Eritrea, NE Africa: Constraints from Fluid Inclusions and C-H-O-S Isotopes

2019 ◽  
Author(s):  
Kai Zhao ◽  
Huazhou Yao ◽  
Jianxiong Wang ◽  
Ghebsha Fitwi Ghebretnsae ◽  
Wenshuai Xiang ◽  
...  
Keyword(s):  
Gold Deposit ◽  
Meteoric Water ◽  
Gold Mineralization ◽  
Early Stage ◽  
Gold Deposits ◽  
Orogenic Gold ◽  
Quartz Veins ◽  
Three Phase ◽  
Igneous Origin ◽  
Ne Africa

The Koka gold deposit is located in the Elababu shear zone between the Nakfa terrane and the Adobha Abiy terrane, NW Eritrea. Based on the paragenetic study two main stages of gold mineralization were identified in the Koka gold deposit: 1) an early stage of pyrite-chalcopyrite-sphalerite-galena-gold-quartz vein; and 2) a second stage of pyrite-quartz veins. NaCl-aqueous inclusions, CO2-rich inclusions, and three-phase CO2-H2O inclusions occur in the quartz veins at Koka. The ore-bearing quartz veins formed at 268℃, from NaCl-CO2-H2O(-CH4) fluids averaging 5 wt% NaCl eq. The ore-forming mechanisms include fluid immiscibility during stage I, and mixing with meteoric water during stage II. Oxygen, hydrogen and carbon isotopes suggest that the ore-forming fluids originated as mixtures of metamorphic water, meteoric water and magmatic water, whereas sulfur isotope suggest an igneous origin. Features of geology and ore-forming fluid at Koka deposit are similar to those of orogenic gold deposits, suggesting the Koka deposit might be an orogenic gold deposit related to granite.

Ore geology, fluid inclusion, and stable isotope constraints on the origin of the Damoqujia gold deposit, Jiaodong Peninsula, China

2020 ◽  
Vol 57 (12) ◽  
pp. 1428-1446
Author(s):  
Peng Chai ◽  
Hong-rui Zhang ◽  
Zeng-qian Hou ◽  
Zhi-yu Zhang ◽  
Lei-lei Dong
Keyword(s):  
Fluid Inclusion ◽  
Gold Deposit ◽  
Eastern China ◽  
Homogeneous System ◽  
Gold Deposition ◽  
Medium Temperature ◽  
Rock Interaction ◽  
Jiaodong Peninsula ◽  
Primary Fluid ◽  
Gold Producer

The Damoqujia gold deposit within the Zhaoping Fault Zone on Jiaodong Peninsula in eastern China is hosted primarily by Mesozoic granitoids and contains >60 t of gold, making it an important gold producer. Three mineralization stages are distinguished (early, middle, and late): (K-feldspar)–sericite–quartz–pyrite, quartz – gold – polymetallic sulfides, and quartz–carbonate. Gold deposition occurred mainly in the middle stage. The primary fluid inclusions of three stages are mainly homogenized at temperatures of 236–389, 191–346, and 104–251 °C, with salinities of 2.96–11.33, 1.39–17.28, and 0.53–11.48 wt.% NaCl equivalent, respectively. Fluid inclusion studies indicate that the metallogenic system evolved from CO2-rich mesothermal homogeneous fluids to CO2-poor aqueous fluids due to inputs of meteoric waters. The gold was carried as a bisulfide complex in the ore-forming fluids. Precipitation of gold was caused by a combination of fluid immiscibility and water–rock interaction. Studies of the fluid inclusion characteristics (medium temperature, CO2-rich, and low salinity H2O–CO2–NaCl homogeneous system), hydrogen and oxygen isotopes ([Formula: see text] = –1.0‰ to 7.6‰, δD = –109‰ to –77‰), sulfur values ([Formula: see text] = 4.5‰ to 8.5‰), and regional geological events show that the ore-forming fluids reservoir was likely metamorphic in origin. Based on the immiscibility of fluid inclusion assemblages, the estimated depth and pressure of trapping are 8.3–10.2 km and 83–276 MPa, respectively, corresponding to the depth and pressure of mineralization.

Hydrothermal alteration of the Sizhuang gold deposit, northwestern Jiaodong Peninsula, eastern China

2019 ◽  
Vol 35 (5) ◽  
pp. 1551-1565
Author(s):  
LIU XiangDong ◽  
◽  
DENG Jun ◽  
ZHANG Liang ◽  
LIN ShaoYi ◽  
...  
Keyword(s):  
Gold Deposit ◽  
Hydrothermal Alteration ◽  
Eastern China ◽  
Jiaodong Peninsula
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