花岗岩是由岩浆源区经历一系列地质作用形成的,这些岩浆通常来自不同的地壳深部源区,而磷灰石是花岗岩中常见的一种副矿物,具有特殊的地化性质,因此了解磷灰石中稀土元素分配机制对岩浆源区的追踪以及岩浆演化和岩石成岩过程的研究是研...花岗岩是由岩浆源区经历一系列地质作用形成的,这些岩浆通常来自不同的地壳深部源区,而磷灰石是花岗岩中常见的一种副矿物,具有特殊的地化性质,因此了解磷灰石中稀土元素分配机制对岩浆源区的追踪以及岩浆演化和岩石成岩过程的研究是研究花岗岩成因的关键。本研究通过对相关实验数据和理论分析的研究,揭示了磷灰石的晶体结构和化学组成对稀土元素分配的影响。研究发现,磷灰石中的Ca2+和磷酸根基团与稀土元素的离子半径和电荷特征相互作用,从而影响稀土元素在磷灰石中的相容性和分配行为。结合广西花山、姑婆山等地区对磷灰石的研究数据以及前人研究成果,进一步探讨了温度、压力等因素对磷灰石与稀土元素相互作用的影响,为研究稀土元素的分配机制和影响因素以及岩浆源区追踪和演化过程提供理论依据。Granite is formed by a series of geological processes in the magma source area, and these magmas usually come from different deep crustal source areas. Apatite is a common accessory mineral in granite and has special geochemical properties. Therefore, understanding the distribution mechanism of rare earth elements in apatite is the key to studying the genesis of granite for the tracking of the magma source area and the research on the magma evolution and rock diagenesis process. Through the research on relevant experimental data and theoretical analysis, this study reveals the influence of the crystal structure and chemical composition of apatite on the distribution of rare earth elements. It is found that the Ca2+ and phosphate groups in apatite interact with the ionic radius and charge characteristics of rare earth elements, thereby affecting the compatibility and distribution behavior of rare earth elements in apatite. Combined with the research data of apatite in areas such as Nanan and Liuchen in Guangxi, as well as the previous research results, the influence of factors such as temperature and pressure on the interaction between apatite and rare earth elements is further discussed, providing a theoretical basis for studying the distribution mechanism and influencing factors of rare earth elements, as well as the tracking and evolution process of the magma source area.展开更多
大坪金矿床是赋存于闪长岩体中的含金多金属硫化物热液石英脉型金矿,矿体呈脉状,三家河断裂、小新街断裂、小寨–金平断裂控制着矿区地层岩性。成矿过程可划分为3个阶段:1) 白钨矿–石英脉阶段;2) 团块状多金属硫化物阶段;3) 碳酸盐–...大坪金矿床是赋存于闪长岩体中的含金多金属硫化物热液石英脉型金矿,矿体呈脉状,三家河断裂、小新街断裂、小寨–金平断裂控制着矿区地层岩性。成矿过程可划分为3个阶段:1) 白钨矿–石英脉阶段;2) 团块状多金属硫化物阶段;3) 碳酸盐–石英脉阶段。石英脉中流体包裹体分为富液相CO2包裹体、富气相CO2包裹体、CO2型包裹体,以CO2-H2O包裹体为主。CO2-H2O包裹体的完全均一温度236.5℃~379.2℃,盐度为1.74~18.63 wt% NaCl,成矿流体具有中–高温、中–低盐度、富含CO2并且含有少量N2的特征,属于CO2-H2O-NaCl ± N2体系,且成矿流体的温度逐渐降低。成矿流体来源复杂,为深源的壳幔混合流体,即成矿流体的主体为深源的流体,后期有浅部的混合流体加入。大坪金矿矿区北部属于造山型金矿,南部属于浅成低温热液型金矿。The Daping gold deposit is a hydrothermal quartz vein-type gold deposit containing gold-bearing polymetallic sulfides hosted in a diorite intrusion. The ore bodies occur as veins, with the regional stratigraphy and lithology controlled by the Sanjiahe Fault, Xiaoxinjie Fault, and Xiaozhai-Jinping Fault. The mineralization process can be divided into three stages: 1) Scheelite-quartz vein stage, 2) Massive polymetallic sulfide stage, and 3) Carbonate-quartz vein stage. Fluid inclusions in the quartz veins can be classified into liquid-rich CO2 inclusions, vapor-rich CO2 inclusions, and CO2-H2O inclusions, with CO2-H2O inclusions being predominant. The homogenization temperatures of CO2-H2O inclusions range from 236.5˚C to 379.2˚C, and their salinities range from 1.74 to 18.63 wt% NaCl equivalent. The ore-forming fluids are characterized by medium-to-high temperatures, medium-to-low salinities, CO2 enrichment, and the presence of small amounts of N2, belonging to the CO2-H2O-NaCl ± N2 system. The temperature of the ore-forming fluids gradually decreased over time. The ore-forming fluids have a complex origin, derived from deep-seated crust-mantle mixed fluids. The main component of the ore-forming fluids is deep-sourced, with later contributions from shallow mixed fluids. The northern part of the Daping gold deposit is classified as an orogenic gold deposit, while the southern part belongs to the epithermal low-temperature hydrothermal gold deposit type.展开更多
文摘花岗岩是由岩浆源区经历一系列地质作用形成的,这些岩浆通常来自不同的地壳深部源区,而磷灰石是花岗岩中常见的一种副矿物,具有特殊的地化性质,因此了解磷灰石中稀土元素分配机制对岩浆源区的追踪以及岩浆演化和岩石成岩过程的研究是研究花岗岩成因的关键。本研究通过对相关实验数据和理论分析的研究,揭示了磷灰石的晶体结构和化学组成对稀土元素分配的影响。研究发现,磷灰石中的Ca2+和磷酸根基团与稀土元素的离子半径和电荷特征相互作用,从而影响稀土元素在磷灰石中的相容性和分配行为。结合广西花山、姑婆山等地区对磷灰石的研究数据以及前人研究成果,进一步探讨了温度、压力等因素对磷灰石与稀土元素相互作用的影响,为研究稀土元素的分配机制和影响因素以及岩浆源区追踪和演化过程提供理论依据。Granite is formed by a series of geological processes in the magma source area, and these magmas usually come from different deep crustal source areas. Apatite is a common accessory mineral in granite and has special geochemical properties. Therefore, understanding the distribution mechanism of rare earth elements in apatite is the key to studying the genesis of granite for the tracking of the magma source area and the research on the magma evolution and rock diagenesis process. Through the research on relevant experimental data and theoretical analysis, this study reveals the influence of the crystal structure and chemical composition of apatite on the distribution of rare earth elements. It is found that the Ca2+ and phosphate groups in apatite interact with the ionic radius and charge characteristics of rare earth elements, thereby affecting the compatibility and distribution behavior of rare earth elements in apatite. Combined with the research data of apatite in areas such as Nanan and Liuchen in Guangxi, as well as the previous research results, the influence of factors such as temperature and pressure on the interaction between apatite and rare earth elements is further discussed, providing a theoretical basis for studying the distribution mechanism and influencing factors of rare earth elements, as well as the tracking and evolution process of the magma source area.
文摘大坪金矿床是赋存于闪长岩体中的含金多金属硫化物热液石英脉型金矿,矿体呈脉状,三家河断裂、小新街断裂、小寨–金平断裂控制着矿区地层岩性。成矿过程可划分为3个阶段:1) 白钨矿–石英脉阶段;2) 团块状多金属硫化物阶段;3) 碳酸盐–石英脉阶段。石英脉中流体包裹体分为富液相CO2包裹体、富气相CO2包裹体、CO2型包裹体,以CO2-H2O包裹体为主。CO2-H2O包裹体的完全均一温度236.5℃~379.2℃,盐度为1.74~18.63 wt% NaCl,成矿流体具有中–高温、中–低盐度、富含CO2并且含有少量N2的特征,属于CO2-H2O-NaCl ± N2体系,且成矿流体的温度逐渐降低。成矿流体来源复杂,为深源的壳幔混合流体,即成矿流体的主体为深源的流体,后期有浅部的混合流体加入。大坪金矿矿区北部属于造山型金矿,南部属于浅成低温热液型金矿。The Daping gold deposit is a hydrothermal quartz vein-type gold deposit containing gold-bearing polymetallic sulfides hosted in a diorite intrusion. The ore bodies occur as veins, with the regional stratigraphy and lithology controlled by the Sanjiahe Fault, Xiaoxinjie Fault, and Xiaozhai-Jinping Fault. The mineralization process can be divided into three stages: 1) Scheelite-quartz vein stage, 2) Massive polymetallic sulfide stage, and 3) Carbonate-quartz vein stage. Fluid inclusions in the quartz veins can be classified into liquid-rich CO2 inclusions, vapor-rich CO2 inclusions, and CO2-H2O inclusions, with CO2-H2O inclusions being predominant. The homogenization temperatures of CO2-H2O inclusions range from 236.5˚C to 379.2˚C, and their salinities range from 1.74 to 18.63 wt% NaCl equivalent. The ore-forming fluids are characterized by medium-to-high temperatures, medium-to-low salinities, CO2 enrichment, and the presence of small amounts of N2, belonging to the CO2-H2O-NaCl ± N2 system. The temperature of the ore-forming fluids gradually decreased over time. The ore-forming fluids have a complex origin, derived from deep-seated crust-mantle mixed fluids. The main component of the ore-forming fluids is deep-sourced, with later contributions from shallow mixed fluids. The northern part of the Daping gold deposit is classified as an orogenic gold deposit, while the southern part belongs to the epithermal low-temperature hydrothermal gold deposit type.
