In this paper,we put forth a discussion about the deep crustal "gravity-tectonic force composite hydrostatic pressure model".The basic understanding of this model is that the deep crustal pressure is composed of two equal parts:gravity and tectonic stress where the tectonic stress field is called "the tectonic additional static pressure".According to this model,it is necessary to remove the tectonic additional static pressure from the total pressure,and then use the structural correction method[depth =gravity induced pressure/(total pressure-additional structural pressure)] to calculate the formation depth.Considering the stress-strain relationship of viscoelastic rock,authors used viscoelastic constitutive equation and obtained the diagenesis depth of coesite-bearing eclogites of ≥30 km in Dabie region Yingshan County,23-53 km in Anhui Yuexi Bixiling region,and 36-40 km in Henan Xinxian region,respectively.Furthermore,using rheology formula for the metamorphic depth calculation,and shear viscosity value of 0.2 × 1023,the formation depth of UHPM rocks was found to be about 50-55 km.Obviously,the formation depth of the Dabie UHPM rocks is between 23-55 km,rather than the previous view of more than 100 km or deeper.Thus,the "deep subduction-reentry" model requires a scientific proof.This research provides some evidence on the high-and ultrahigh-pressure metamorphism by "tectonic pressure shell causes".

Jiaodong gold mine is one of the most largest gold deposits related with granites in the world.This paper points out that Jiaodong gold deposits formed in the inland after plate collison in Mesozoic,and that they belong to “Diwa”tectonic areas.The authors substitute a new concept of “magmatic core complex”for “meta-morphic core complex”.There are the “magmatic core complex”in Jiaodong ,which posses granite core (1 80-1 30 Ma),metamorphic wall-rock (2,500 -1 ,300 Ma)and their lid of volcanic sedimentary basin.Shear zones are located among the granites,metamorphics and sedimentary beds;the shear zones between the granite core and the metamorphic wall rocks return into the detachment fault with wide toughness-brittleness cataclastic rocks at the side of granites;therefore,the Jiaodong gold deposits of phyllic alteration form by the post-magmat-ic hydrothermal liquid in fault cataclastic rocks(1 20 -1 00 Ma).The Jiaodong “magmatic core complex”struc-ture perhaps is a common geologic phenomenon at actic Mesozoic in China.

玲珑金矿田位于招远市城北20km玲珑镇,矿区内48、50号脉目前的勘探深度已分别超过超过1300m和1400m,随着勘探深度的增加,找矿难度也越来越大.如何根据地表显示的有效地质、地球化学异常信息推断深部隐伏矿体的存在及其位置是一项极具挑战性的任务.本文在结合勘探工程和前人资料的基础上,紧密结合深部找矿难题,采用“构造蚀变岩相填图+构造蚀变岩分带特征+构造地球化学分析”预测方法(李惠等,2014;李惠等,2006;吕古贤等,2001),对玲珑金矿田九曲一大开头矿段48、50号脉开展深部找矿预测工作,在深部-800m以下总共提交4个成矿靶区,并取得了良好的钻探验证效果,这对于胶东金矿山深部外围找矿具有重要的示范意义,对于其他类似矿床也有参考价值.

矿田系指矿床密集分布,成矿作用集中发育,且在时间、空间和构造建造上具有紧密联系的矿化赋存区段(克列特尔,1956;沃尔弗逊,1966;),相当于Ⅴ级成矿区划单元(陈毓川等,1989;朱裕生等,1999). 1 矿田地质学的概念和研究内容

1 区域地质简介 玲珑金矿田位于招远市城北20km玲珑镇,区内所见地层为新生界第四系山前组(Qs)、胶东岩群苗家岩组(ArjM)和胶东岩群郭格庄岩组(Ar3jG).矿体多赋存于玲珑花岗岩中.矿体矿化严格受断裂构造和交代蚀变岩带控制,以NE、NEE和NNE走向的三组断裂最发育,倾向NW或SE.

矿床是一种复杂系统,而成矿作用则是一种复杂的动力学过程.矿床成因的基本问题归根结底是成矿作用动力学问题(於崇文,1994).成矿作用动力学研究成矿作用的速率、机制和过程.构造动力是成矿的基本因素之一,不同构造动力体制产生不同的成矿系统(翟裕生,2002).常见的构造动力学体制有七种类型:伸展拉伸、挤压收缩、走滑、隆升、沉降、大型韧性剪切和大型陨石撞击(翟裕生,2003).胶东金矿与中生代岩浆作用关系密切,对于指导区域找矿研究岩浆的隆起意义重大(吕古贤,2016),控矿断裂和蚀变岩都是岩浆成岩之后的产物.胶东地区长期处于大陆边缘,构造成岩成矿作用过程表现出复杂性和多样性(邓军,1999),研究构造性质与金矿的关系,认为胶东金矿是花岗岩和变质岩之间剪切拆离滑脱破碎岩带受岩浆期后热液交代蚀变的产物(吕古贤,2013).岩浆期后的热液交代岩浆岩蚀变成矿,控制蚀变岩的断裂破碎岩以及断裂对成矿的控制作用一直是研究的重点.