3D geochemical modeling of the Qujia gold deposit, China: Implications for ore genesis and geochemical exploration of deep concealed ore bodies

Wang, Qiang; Wang, Xueqiu; Liu, Hanliang; Yan, Taotao; Zhang, Bimin; Tian, Mi; De-ping, Yang; Xiong, Yujiu

doi:10.1016/j.oregeorev.2022.104819

Cited by 6 publications

(2 citation statements)

References 127 publications

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“…Previous studies suggest that I-type granites have a mixed origin, including both crustal-and mantle-derived components (Whalen et al, 1987;Chappell, 1999;Wang et al, 2019). Remelting of sediments by mantle derived from magmas can also form I-type granites (Whalen et al, 1987), and a decrease in the relative contribution of sediment during crustal remelting can lead to the transition from S-type magmas to I-type magmas (Collins et al, 1982).…”

Section: Magma Source and Tectonic Settingmentioning

confidence: 99%

Neoproterozoic I-type granites in the Central Tianshan Block (NW China): geochronology, geochemistry, and tectonic implications

et al. 2021

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The Central Tianshan Block is one of numerous microcontinental blocks within the Central Asian Orogenic Belt (CAOB) that overlies Precambrian basement rocks. Constraining the evolution of these ancient basement rocks is central to understanding the accretionary and collisional tectonics of the CAOB, and their place within the Rodinia supercontinent. However, to date, the timing and tectonic settings in which the basement rocks in the Central Tianshan Block formed are poorly constrained, with only sparse geochemical and geochronological data from granitic rocks within the northern segment of the block. Here, we present a systematic study combining U-Pb geochronology, whole-rock geochemistry, and the Sr-Nd isotopic compositions of newly-identified granitic gneisses from the Bingdaban area of Central Tianshan Block. The analyzed samples yield a weighted mean Neoproterozoic 206 Pb/ 238 U ages of 975-911 Ma. These weakly-peraluminous granitic rocks show a common geochemical I-type granite affinity. The granitic gneisses are calc-alkaline and enriched in large ion lithophile elements (LILEs) and light rare earth elements (LREEs), but they are depleted in high field strength elements (HFSEs); these characteristics are similar to those of typical subduction-related magmatism. All samples show initial ( 87 Sr/ 86 Sr) (t) ratios between 0.705136 and 0.706745. Values for Ɛ Nd(t) in the granitic gneisses are in the range from -5.7 to -1.2, which correspond to Nd model ages of 2.0-1.7 Ga, indicating a role for Mesoproterozoic to Paleoproterozoic rocks in the generation of the granitic protoliths. The documented geochemical features indicate that the protoliths for the gneisses have a similar petrogenesis and magmatic source, which may reflect partial melting of thickened crust with the addition of small amounts of mantle-derived material. The Central Tianshan Block probably constitute part of an exterior orogen that developed along the margin of the Rodinian supercontinent during the Early Neoproterozoic and underwent a transition from subduction to syn-collision compression at 975-911 Ma.

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Section: Magma Source and Tectonic Settingmentioning

confidence: 99%

Neoproterozoic I-type granites in the Central Tianshan Block (NW China): geochronology, geochemistry, and tectonic implications

et al. 2021

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“…They constructed an informationbased three-dimensional ore body model to realize mineralization information mining. In addition, Wang et al compared the interpolation effects of different mineral contents through the 3D voxel ore body model [30]. It can be seen that the voxel model is beneficial to constructing and analyzing the three-dimensional model of the ore body.…”

Section: Introductionmentioning

confidence: 99%

Efficient Construction of Voxel Models for Ore Bodies Using an Improved Winding Number Algorithm and CUDA Parallel Computing

Liu,

Sun,

et al. 2023

IJGI

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The three-dimensional (3D) geological voxel model is essential for numerical simulation and resource calculation. However, it can be challenging due to the point in polygon test in 3D voxel modeling. The commonly used Winding number algorithm requires the manual setting of observation points and uses their relative positions to restrict the positive and negative solid angles. Therefore, we proposed the Winding number with triangle network coding (WNTC) algorithm and applied it to automatically construct a 3D voxel model of the ore body. The proposed WNTC algorithm encodes the stratum model by using the Delaunay triangulation network to constrain the index order of each vertex of the triangular plane unit. GPU parallel computing was used to optimize its computational speed. Our results demonstrated that the WNTC algorithm can greatly improve the efficiency and automation of 3D ore body modeling. Compared to the Ray casting method, it can compensate for a voxel loss of about 0.7%. We found the GPU to be 99.96% faster than the CPU, significantly improving voxel model construction speed. Additionally, this method is less affected by the complexity of the stratum model. Our study has substantial potential for similar work in 3D geological modeling and other relevant fields.

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3D modeling for mineral resource assessment of fluorite ore and its industrial application in Jbel Tirremi, northeast Morocco

Cherai¹,

Rddad

Talbi³

et al. 2023

Model. Earth Syst. Environ.

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3D geochemical modeling of the Qujia gold deposit, China: Implications for ore genesis and geochemical exploration of deep concealed ore bodies

Cited by 6 publications

References 127 publications

Neoproterozoic I-type granites in the Central Tianshan Block (NW China): geochronology, geochemistry, and tectonic implications

Neoproterozoic I-type granites in the Central Tianshan Block (NW China): geochronology, geochemistry, and tectonic implications

Efficient Construction of Voxel Models for Ore Bodies Using an Improved Winding Number Algorithm and CUDA Parallel Computing

3D modeling for mineral resource assessment of fluorite ore and its industrial application in Jbel Tirremi, northeast Morocco

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