The Experts below are selected from a list of 25977 Experts worldwide ranked by ideXlab platform
Mlr Key - One of the best experts on this subject based on the ideXlab platform.
-
molybdenite re os and shrimp zircon u pb dating of duobuza porphyry copper Deposit in tibet and its geological implications
Mineralium Deposita, 2009Co-Authors: She Hong, Mlr KeyAbstract:The Duobuza porphyry copper Deposit,the first large-size porphyry copper Deposit discovered along the Bangong-Nujiang suture zone,is situated in the Duobuza tectonic-magmatic zone on the southern margin of the Qiangtang-Sanjiang massif.The main mineralized porphyry in the Ore Deposit is a granodiorite porphyry,whose SiO2 content varies from 61.37% to 67.73%,65.16% on the average.Its REE content is (41.4～94)×10-6,and the LREE content is higher than the HREE content,suggesting the enrichment of LREE.As for trace elements,the porphyry shows enrichment of Rb,K,Th,Ba,La,Ce,Sr and depletion of Nb,Ta,P,Ti.The major,rare earth and trace elements of the mineralized porphyry have characteristics of volcanic rocks formed in the island arc.The zircon SHRIMP dating (14 samples) of Duobuza granodiorite porphyry gave 206Pb/238U concordant ages from (116.5±4.6) Ma to (125.3±4.7) Ma,with a weighted mean age of (120.9±2.4) Ma,which indicates the age of the copper-mineralized porphyry rock.Meanwhile,the 187Re and 187Os content of molybdenite from the Ore Deposit was determined by Inductively Coupled Plasma Mass Sperctrometry (ICP-MS),and the results show that the Re-Os model ages of the Deposit are from (117.6±1.3) to (118.5±1.4) Ma,and its isochron age (118.0±1.5) Ma,which have accurately determined the timing of mineralization.The age of the Ore Deposit is consistent with the evolution of the Bange-Nujiang archipelagic arc-basin system in Early Cretaceous,implying that the Duobuza copper Deposit was formed in an archipelagic are-basin system similar to the system of southeast Asia.
Li Tang - One of the best experts on this subject based on the ideXlab platform.
-
delineation of potential exploration targets based on 3d geological modeling a case study from the laoangou pb zn ag polymetallic Ore Deposit china
Ore Geology Reviews, 2017Co-Authors: Fan Yang, Gongwen Wang, M Santosh, Ruixi Li, Li TangAbstract:Abstract The Laoangou Pb-Zn-Ag polymetallic Ore Deposit (LAG) is a hydrothermal vein-type Deposit in the East Qinling polymetallic metallogenic belt, which is controlled by NW-, NE- and nearly SN-trending faults and mainly hosted in the dolomite marble of Meiyaogou and Baishugou formations within the Luanchuan Ore district (LOD). Although district-scale metallogenic prediction related to the Pb-Zn-Ag Deposits in the LOD has been attempted, there have been no studies to formulate a detailed Deposit-scale metallogenic prediction of the Pb-Zn-Ag Deposit in 3D space. Here we selected the LAG to formulate a metallogenic prediction model for Pb-Zn-Ag Deposit based on data from 1:10,000 scale geological map, and 66 bOreholes and 39 sections of exploration lines on 1:1000 scale, to extract the salient spatial features of the Deposit. We apply ordinary weights and weighted weights of evidence, followed by boosted weights of evidence, logistic regression and information entropy for integrating the features of the Ore Deposit for exploration targeting. The C–V fractal method is applied to classify the probabilities. Accordingly, three levels of exploration targets are delineated: the first level targets are mainly distributed in the periphery of known Orebodies (M2, M3, II-3 and VI), which are also located in the Ore-controlling strata and fault zones; the second level targets are located in the region of known Orebodies, indirectly confirming that the prediction result is reliable; and the third level targets, which are mainly located at the contact between Ore-controlling strata and metagabbro bodies, offer new targets for exploration in this Ore district. Combining our results obtained in this study with those in previous studies, we provide some guidelines for exploration targets in the Pb-Zn-Ag Deposits in the LOD, which might help in mOre effectively delineating the target zones.
-
Timing of formation of the Hongdonggou Pb-Zn polymetallic Ore Deposit, Henan Province, China: Evidence from Rb-Sr isotopic dating of sphalerites
Elsevier, 2017Co-Authors: Fan Yang, Gongwen Wang, Huawen Cao, Li Tang, Yufeng Huang, Hao Zhang, Fei Xue, Wenjuan Jia, Nana GuoAbstract:The Hongdonggou Pb-Zn polymetallic Ore Deposit, located in the southwestern part of the Luanchuan Mo-W-Pb-Zn-Ag polymetallic Ore mineralization in Henan Province, China, is an important part of the East Qinling metallogenic belt. The Orebodies in the Deposit, which are vein, bedded and lenticular, are mainly hosted in the syenite porphyry, and formed within the carbonate and clastic rocks of the Yuku and Qiumugou formations partially. The genesis of the Deposit has previously been argued to be of hydrothermal-vein type or of skarn-hydrothermal type. In this study, we report the results of Rb-Sr isotopic dating based on sphalerites from the main Orebody of the Hongdonggou Pb-Zn polymetallic Ore Deposit, which yield an isochron age of 135.7 ± 3.2 Ma, constraining the timing of mineralization as early Cretaceous. The age is close to those reported for the Pb-Zn Deposits in the Luanchuan Ore belt. The (87Sr/86Sr)i values of the sphalerites (0.71127 ± 0.00010) are lower than that of terrigenous silicates (0.720) and higher than the mantle (0.707), suggesting that the metallogenic components were mainly derived through crust-mantle mixing. Combining the results from this study with those from previous work, we propose that the Hongdonggou Pb-Zn polymetallic Ore Deposit is a hydrothermal-vein Deposit associated with the early Cretaceous tectonothermal event, and the mineralization is controlled by NW- and near EW-trending faults in the Luanchuan Mo-W-Pb-Zn-Ag polymetallic Ore concentration belt
She Hong - One of the best experts on this subject based on the ideXlab platform.
-
molybdenite re os and shrimp zircon u pb dating of duobuza porphyry copper Deposit in tibet and its geological implications
Mineralium Deposita, 2009Co-Authors: She Hong, Mlr KeyAbstract:The Duobuza porphyry copper Deposit,the first large-size porphyry copper Deposit discovered along the Bangong-Nujiang suture zone,is situated in the Duobuza tectonic-magmatic zone on the southern margin of the Qiangtang-Sanjiang massif.The main mineralized porphyry in the Ore Deposit is a granodiorite porphyry,whose SiO2 content varies from 61.37% to 67.73%,65.16% on the average.Its REE content is (41.4～94)×10-6,and the LREE content is higher than the HREE content,suggesting the enrichment of LREE.As for trace elements,the porphyry shows enrichment of Rb,K,Th,Ba,La,Ce,Sr and depletion of Nb,Ta,P,Ti.The major,rare earth and trace elements of the mineralized porphyry have characteristics of volcanic rocks formed in the island arc.The zircon SHRIMP dating (14 samples) of Duobuza granodiorite porphyry gave 206Pb/238U concordant ages from (116.5±4.6) Ma to (125.3±4.7) Ma,with a weighted mean age of (120.9±2.4) Ma,which indicates the age of the copper-mineralized porphyry rock.Meanwhile,the 187Re and 187Os content of molybdenite from the Ore Deposit was determined by Inductively Coupled Plasma Mass Sperctrometry (ICP-MS),and the results show that the Re-Os model ages of the Deposit are from (117.6±1.3) to (118.5±1.4) Ma,and its isochron age (118.0±1.5) Ma,which have accurately determined the timing of mineralization.The age of the Ore Deposit is consistent with the evolution of the Bange-Nujiang archipelagic arc-basin system in Early Cretaceous,implying that the Duobuza copper Deposit was formed in an archipelagic are-basin system similar to the system of southeast Asia.
Fan Yang - One of the best experts on this subject based on the ideXlab platform.
-
delineation of potential exploration targets based on 3d geological modeling a case study from the laoangou pb zn ag polymetallic Ore Deposit china
Ore Geology Reviews, 2017Co-Authors: Fan Yang, Gongwen Wang, M Santosh, Ruixi Li, Li TangAbstract:Abstract The Laoangou Pb-Zn-Ag polymetallic Ore Deposit (LAG) is a hydrothermal vein-type Deposit in the East Qinling polymetallic metallogenic belt, which is controlled by NW-, NE- and nearly SN-trending faults and mainly hosted in the dolomite marble of Meiyaogou and Baishugou formations within the Luanchuan Ore district (LOD). Although district-scale metallogenic prediction related to the Pb-Zn-Ag Deposits in the LOD has been attempted, there have been no studies to formulate a detailed Deposit-scale metallogenic prediction of the Pb-Zn-Ag Deposit in 3D space. Here we selected the LAG to formulate a metallogenic prediction model for Pb-Zn-Ag Deposit based on data from 1:10,000 scale geological map, and 66 bOreholes and 39 sections of exploration lines on 1:1000 scale, to extract the salient spatial features of the Deposit. We apply ordinary weights and weighted weights of evidence, followed by boosted weights of evidence, logistic regression and information entropy for integrating the features of the Ore Deposit for exploration targeting. The C–V fractal method is applied to classify the probabilities. Accordingly, three levels of exploration targets are delineated: the first level targets are mainly distributed in the periphery of known Orebodies (M2, M3, II-3 and VI), which are also located in the Ore-controlling strata and fault zones; the second level targets are located in the region of known Orebodies, indirectly confirming that the prediction result is reliable; and the third level targets, which are mainly located at the contact between Ore-controlling strata and metagabbro bodies, offer new targets for exploration in this Ore district. Combining our results obtained in this study with those in previous studies, we provide some guidelines for exploration targets in the Pb-Zn-Ag Deposits in the LOD, which might help in mOre effectively delineating the target zones.
-
Timing of formation of the Hongdonggou Pb-Zn polymetallic Ore Deposit, Henan Province, China: Evidence from Rb-Sr isotopic dating of sphalerites
Elsevier, 2017Co-Authors: Fan Yang, Gongwen Wang, Huawen Cao, Li Tang, Yufeng Huang, Hao Zhang, Fei Xue, Wenjuan Jia, Nana GuoAbstract:The Hongdonggou Pb-Zn polymetallic Ore Deposit, located in the southwestern part of the Luanchuan Mo-W-Pb-Zn-Ag polymetallic Ore mineralization in Henan Province, China, is an important part of the East Qinling metallogenic belt. The Orebodies in the Deposit, which are vein, bedded and lenticular, are mainly hosted in the syenite porphyry, and formed within the carbonate and clastic rocks of the Yuku and Qiumugou formations partially. The genesis of the Deposit has previously been argued to be of hydrothermal-vein type or of skarn-hydrothermal type. In this study, we report the results of Rb-Sr isotopic dating based on sphalerites from the main Orebody of the Hongdonggou Pb-Zn polymetallic Ore Deposit, which yield an isochron age of 135.7 ± 3.2 Ma, constraining the timing of mineralization as early Cretaceous. The age is close to those reported for the Pb-Zn Deposits in the Luanchuan Ore belt. The (87Sr/86Sr)i values of the sphalerites (0.71127 ± 0.00010) are lower than that of terrigenous silicates (0.720) and higher than the mantle (0.707), suggesting that the metallogenic components were mainly derived through crust-mantle mixing. Combining the results from this study with those from previous work, we propose that the Hongdonggou Pb-Zn polymetallic Ore Deposit is a hydrothermal-vein Deposit associated with the early Cretaceous tectonothermal event, and the mineralization is controlled by NW- and near EW-trending faults in the Luanchuan Mo-W-Pb-Zn-Ag polymetallic Ore concentration belt
Tatsuo Nozaki - One of the best experts on this subject based on the ideXlab platform.
-
re os geochronology of the hitachi volcanogenic massive sulfide Deposit the oldest Ore Deposit in japan
Economic Geology, 2014Co-Authors: Yasuhiro Kato, Tatsuo Nozaki, Katsuhiko SuzukiAbstract:The Hitachi volcanogenic massive sulfide (VMS) Deposit in the Hitachi belt is one of the largest Cu-Zn sulfide Deposits in Japan. However, its primary formation age has not been precisely determined because regional and contact metamorphism have disturbed some radiometric isotope systems, e.g., K-Ar ages on wall rocks. Further metamorphism has greatly reduced the fossil record, which has limited the use of biostratigraphy. To establish the Ore Deposit age, we applied Re-Os isotope dating to samples from two representative sulfide Deposits of the greater Hitachi VMS Deposit: the Fudotaki and Fujimi Deposits. Re-Os isotope data from the Fudotaki Deposit yields a model 3 age of 533 ± 13 Ma, with an initial 187 Os/ 188 Os ratio of 0.35 ± 0.20. In contrast, Re-Os isotope data from the Fujimi sulfide Ore did not exhibit a linear correlation, suggesting that the Re-Os isotope system there has been disturbed by regional metamorphism of higher grade than the Fudotaki Deposit as well as contact metamorphism during intrusion of Cretaceous granitic rocks. Although the Fudotaki sulfide Ores have been metamorphosed to lower epidote-amphibolite facies, the well-defined Re-Os isochron allowed us to interpret the timing of primary sulfide Deposition on the paleoseafloor. Some Orebodies of the greater Hitachi VMS Deposit have been estimated to be Early Carboniferous based on the scarce fossil records and considered to be distributed in the Daioin Formation, but our results revealed that the Fudotaki Deposit were formed during the Cambrian and occurs in the Upper Akazawa Formation, which strongly supports the idea that the Cambrian beds are widely distributed in the Hitachi belt and that a significant unconformity exists between the Cambrian and Early Carboniferous above the Fudotaki Deposit. The Cambrian Re-Os date classifies the Hitachi VMS Deposit as the oldest dated Ore Deposit in Japan, and in turn provides an insight to understand the geologic framework and genesis of the proto-Japanese islands and the East Asian region.