RESEARCH ON TECTONIC DYNAMO-PETROGENESIS AND METALLOGENESIS AND TECTONOPHYSICOCHEMISTRY
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摘要:
动力成岩成矿"的理论是地质力学构造控岩控矿研究方面的重要进展,是上世纪70-80年代初,在构造地球化学领域关于应力矿物、岩石变形-变质关系、构造控矿等研究基础上提出的。应用动力成岩成矿载体的"构造岩相带",在新疆沙尔托海铬铁矿开展深部找矿取得重大突破。后续研究,从"动力成岩成矿"阶段,发展到现今的"构造物理化学"阶段。基于固体力学原理,研究认为变形岩石由偏应力场引起,偏应力场可分为差应力状态和各向等正应力状态两个部分,后者被命名为"构造附加静水压力"。"构造附加静水压力"不仅能引起岩石体积变化,也能影响其中化学平衡,是一个物理化学变量。结合胶东金矿的长期研究发现,元素地球化学分布是化学平衡的结果,物理化学环境才是化学作用的原因,提出"构造力改变压力温度等条件影响化学平衡"的认识。创建"成矿深度构造校正"方法,预测胶东金矿深部"第二富集带"得到证实,促进胶东从危机矿山重灾区转而成为全球第三大金矿区。经过40多年的理论研究、地质调查和找矿实践,构造物理化学取得显著进展,1996年地质力学专业委员会设立"构造物理化学专业学组"。2018年,中国地球物理学会成立"构造物理化学专业委员会"。
Abstract:The theory of "dynamo-petrogenesis and metallogenesis" was proposed in the early 1970s~1980s on the basis of research in the field of tectonogeochemistry such as stress minerals, rock deformation-metamorphism relation and structural control on ore. It represents a significant progress in the aspect of research on structural control on ore in geomechanics field. Applying "tectonic-lithofacies zone", i.e., the carrier of dynamo-petrogenesis and metallogenesis, great breakthroughs have been made in deep ore prospecting of the Shaertuohai chromite deposit, Xinjiang. Subsequent research has developed from the stage of "dynamo-petrogenesis and metallogenesis" to the present-day "tectonophysicochemistry" stage. Based on solid mechanics, research indicates that deformed rocks are formed by deviatoric stress field, which can be divided into differential stress and isotropic stress sections; the latter is named as "additional tectonic hydrostatic pressure". As a physicochemical variable, it can not only arouse rock volume variation but also can affect the chemical equilibrium. Combined with the long-term research on gold deposits in eastern Shandong, it was found that element geochemical distribution is a result of chemical equilibrium and physical chemistry is the cause of chemical action; accordingly, the thought of "The chemical equilibrium is affected by the change of pressure and temperature of tectonic forces" is proposed. The method of "structural correction based on ore-forming depth" has demonstrated the existence of the predicated "secondary enrichment zone" in gold deposits in eastern Shandong, promoting eastern Shandong to become the global third largest gold field from a crisis-mine severely afflicted area. Over more than 40 years' theoretical research, geological survey and prospecting practice, great progress has been made in tectonophysicochemistry. In 1996, the Professional Committee of Geomechanics set up the "Tectonophysicochemistry Professional Group". In 2018, "the Professional Committee of Tectonophysicochemistry" was approved by Chinese Geophysical Society.
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图 1 褶皱中物质重新调整方式[7]
Figure 1.
图 9 不同的构造带构造附加静压力分布[13]
Figure 9.
表 1 玲珑-焦家式金矿床成矿模式图
Table 1. The metallogenic model of the Linglong-Jiaojia gold deposit
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