Organics exhibit close spatial,temporal,and genetic relationships with Mississippi Valley-Type(MVT)Pb-Zn deposits.Understanding its specific roles in ore formation is therefore crucial for advancing metallogenic predi...Organics exhibit close spatial,temporal,and genetic relationships with Mississippi Valley-Type(MVT)Pb-Zn deposits.Understanding its specific roles in ore formation is therefore crucial for advancing metallogenic prediction and exploration.This study focuses on the thermal evolution of organics in sedimentary basins and the key controlling effects of its products on MVT Pb-Zn mineralization.By systematically analyzing the thermal evolution history and thermal maturity characteristics of organics,it provides a new perspective for revealing the genetic mechanisms of Pb-Zn deposits and guiding exploration.Research demonstrates a significant coupling relationship between organics and MVT Pb-Zn deposits in spatial-temporal distribution and genetic mechanisms,with organics exhibiting different functional mechanisms at various stages of mineralization:During the activation-extraction stage of metallogenic materials,organic acids generated from the thermal evolution of organics possess strong complexation capabilities for metal elements like lead and zinc,effectively activating and extracting these elements from source rocks,thereby providing favorable conditions for initial enrichment.During the transport stage,oilfield brines,as important ore-forming fluids,likely serve as ideal carriers for the migration of metal elements such as lead and zinc.During the precipitation stage,organics primarily facilitate metal sulfide precipitation either by directly providing reduced sulfur or by acting as a reducing agent to reduce sulfate,thereby supplying reduced sulfur.Based on the coupling relationship between organics and mineralization,and leveraging interdisciplinary advantages from inorganic-organic geochemistry,economic geology,and tectonic geology,modern analytical techniques such as Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry(LA-ICP-MS)and artificial intelligence-assisted methods can be employed to precisely identify and quantitatively analyze biomarkers(e.g.,n-alkanes,isoprenoids,steranes,organic sulfur compounds)in organics like solid bitumen and organic inclusions.Their characteristic parameters can be used to trace the source of metallogenic materials,constrain the physicochemical conditions(e.g.,temperature,pressure)of the ore-forming fluids,delineate the mineralization process,and constrain the metallogenic epoch,thereby constructing a multi-stage comprehensive metallogenic model involving organics.Simultaneously,organic geochemical surveys can delineate organic geochemical anomalies(e.g.,methane,aromatic hydrocarbons)related to mineralization in rocks and soils,facilitating the construction of multi-scale,multi-factor metallogenic prediction models.This approach can significantly enhance the accuracy and reliability of metallogenic prediction,thereby improving the effectiveness of both deposit research and exploration.展开更多
长期以来,成矿时代的精确限定是困扰MVT铅锌矿床研究中最大难题之一。随着放射性同位素定年方法精度的提高和制样工艺的改进,闪锌矿等硫化物Rb-Sr同位素等时线法已成为可以直接测定MVT矿床成矿年龄的有效方法(Nakai and Halliday,1993)...长期以来,成矿时代的精确限定是困扰MVT铅锌矿床研究中最大难题之一。随着放射性同位素定年方法精度的提高和制样工艺的改进,闪锌矿等硫化物Rb-Sr同位素等时线法已成为可以直接测定MVT矿床成矿年龄的有效方法(Nakai and Halliday,1993)。前人采用这一方法对分布于四川盆地北缘米仓山一带的马元铅锌矿已进行过Rb-Sr同位素定年(李厚民等,2007)。该矿床与古油藏密切共生,展开更多
基金supported by the National Natural Science Foundation of China(Grant No.42372115)the International Geological Correlation Programmes(Grant No.IGCP-741)the Qinghai Province“Kunlun Talents High-End Innovation and Entrepreneurship Talents”Project(Qing Talent Character[2024]No.1).
文摘Organics exhibit close spatial,temporal,and genetic relationships with Mississippi Valley-Type(MVT)Pb-Zn deposits.Understanding its specific roles in ore formation is therefore crucial for advancing metallogenic prediction and exploration.This study focuses on the thermal evolution of organics in sedimentary basins and the key controlling effects of its products on MVT Pb-Zn mineralization.By systematically analyzing the thermal evolution history and thermal maturity characteristics of organics,it provides a new perspective for revealing the genetic mechanisms of Pb-Zn deposits and guiding exploration.Research demonstrates a significant coupling relationship between organics and MVT Pb-Zn deposits in spatial-temporal distribution and genetic mechanisms,with organics exhibiting different functional mechanisms at various stages of mineralization:During the activation-extraction stage of metallogenic materials,organic acids generated from the thermal evolution of organics possess strong complexation capabilities for metal elements like lead and zinc,effectively activating and extracting these elements from source rocks,thereby providing favorable conditions for initial enrichment.During the transport stage,oilfield brines,as important ore-forming fluids,likely serve as ideal carriers for the migration of metal elements such as lead and zinc.During the precipitation stage,organics primarily facilitate metal sulfide precipitation either by directly providing reduced sulfur or by acting as a reducing agent to reduce sulfate,thereby supplying reduced sulfur.Based on the coupling relationship between organics and mineralization,and leveraging interdisciplinary advantages from inorganic-organic geochemistry,economic geology,and tectonic geology,modern analytical techniques such as Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry(LA-ICP-MS)and artificial intelligence-assisted methods can be employed to precisely identify and quantitatively analyze biomarkers(e.g.,n-alkanes,isoprenoids,steranes,organic sulfur compounds)in organics like solid bitumen and organic inclusions.Their characteristic parameters can be used to trace the source of metallogenic materials,constrain the physicochemical conditions(e.g.,temperature,pressure)of the ore-forming fluids,delineate the mineralization process,and constrain the metallogenic epoch,thereby constructing a multi-stage comprehensive metallogenic model involving organics.Simultaneously,organic geochemical surveys can delineate organic geochemical anomalies(e.g.,methane,aromatic hydrocarbons)related to mineralization in rocks and soils,facilitating the construction of multi-scale,multi-factor metallogenic prediction models.This approach can significantly enhance the accuracy and reliability of metallogenic prediction,thereby improving the effectiveness of both deposit research and exploration.
文摘长期以来,成矿时代的精确限定是困扰MVT铅锌矿床研究中最大难题之一。随着放射性同位素定年方法精度的提高和制样工艺的改进,闪锌矿等硫化物Rb-Sr同位素等时线法已成为可以直接测定MVT矿床成矿年龄的有效方法(Nakai and Halliday,1993)。前人采用这一方法对分布于四川盆地北缘米仓山一带的马元铅锌矿已进行过Rb-Sr同位素定年(李厚民等,2007)。该矿床与古油藏密切共生,
