Structural Alteration Zone and Listric Distribution Characteristics in Northwest Jiaodong Peninsula

doi:10.19657/j.geoscience.1000-8527.2021.108

Abstract

Abstract:

Jiaodong is the world’s largest Mesozoic granite-related hydrothermal/metasomatic gold province, and the gold mineralization is related to faulting and alteration. In this paper, the Jiaojia and Zhaoping faults are taken as typical examples to study the geological characteristics of the listric ore-controlling fault distributions, through measuring the deformation and alteration profile and geological mapping. The results revealed that: (1) the fault alteration zone is hundreds of meters to over kilometers wide, instead of meters as previously suggested. The scale and intensity of alteration control the gold mineralization. (2) Orientation for the upper and lower part of the fault is steep and gentle, respectively. Dip angle for the shallow (above -200 m) and deeper (below -400 m) parts of the fault is around 70° and 20°-30°, respectively. The fault morphology is listric. (3) The listric fault indicates motion characteristic of sliding hanging wall, and the stress-strain features show that the mineralization occurred in the regional stress relaxation stage. (4) Dip direction of the fault controls the lateral trend of the mineralized zone. The Jiaojia fault dips to the NW, and the associated mineralization zone trends SW; the Zhaoping fault dips to the SE, and the associated mineralization zone trends NE.

Key words: Jiaodong gold deposit, deformed lithofacies, alteration zone, listric fault-controlled mineralization

CLC Number:

P548
P552

LÜ Chengxun, HUO Qinglong, TANG Zhanxin, FAN Xiao, TANG Lei, XU Yaqing, YUAN Yuelei. Structural Alteration Zone and Listric Distribution Characteristics in Northwest Jiaodong Peninsula[J]. Geoscience, 2021, 35(05): 1274-1281.

Figures/Tables 12

Fig.1 Geological map of Jiaodong peninsula and the location of faults and gold deposits (adapted from LÜ Chengxun [19], 2012)

Fig.2 Sketch map of alteration zone along the Jiaojia fault

Fig.3 Measured geologic profile of the Wangershan-Jinhuashan structural alteration zone

Table 1 Geological features of NNE-NE-trending faults in the Jiaojia orefield

断裂名称	规模出露长度/km	断裂带宽度/m	产状			断裂带主要岩性和特征	沿断裂带分布的主要矿床
断裂名称	规模出露长度/km	断裂带宽度/m	走向	倾向/倾角		断裂带主要岩性和特征	沿断裂带分布的主要矿床
焦家断裂	20	50~300	NE 40°~45°		NW 28°~45°	压扭性,上盘胶东岩群变质岩,下盘玲珑花岗岩	马塘、焦家、红布、新城
河东— 望儿山断裂	9	2~200	近SN		NW 30°~60°	压扭性,带内发育糜棱岩, 片理化带及断层泥	河东、望儿山金矿
北截— 灵山沟断裂	24	1~10	NE 40°~45°		SE 45°~50°	压扭性,縻棱岩, 片理化带及断层泥	灵山沟、北截金矿床

Fig.4 Profile of faulting and alteration zone for Exploration Line No.64 in the Jiaojia gold deposit

Fig.5 Sketch map of the Zhaoping fault zone

Table 2 Alteration characteristics of listric faults in the Jiaojia gold deposit

标高/m	断裂倾角/(°)	绢英岩化蚀变带宽度/m	强钾长石化蚀变带宽度/m	弱钾长石蚀变带宽度/m	蚀变带总宽度/m
0	70	100	600	150	850
-200	60	150	650	200	1 000
-300	30	300	700	200	1 200
-400	20	500	750	200	1 450

Fig.6 Measured profile of structural alteration zone of the Zhaoping fault

Fig.7 Sketch profile of Exploration Line No.21 in the Tai-shang gold deposit

Fig.8 Sketch profile of Exploration Line No.76 in the Dayingezhuang gold deposit

Fig.9 Sketch profile of Orebody No.7 in the Xiadian gold deposit

Fig.10 Schematic diagram showing the geometric characteristics of the Zhaoping detachment fault zone

References 22

[1]	吕古贤. 胶东半岛构造-岩相形式及玲珑-焦家式金矿的构造动力成岩地质特征研究[D]. 北京:中国地质科学院, 1989.
[2]	吕古贤. 胶东半岛构造-岩相形式及玲珑焦家式金矿的构造动力成岩成矿地质特征研究[J]. 中国地质科学院院报, 1991, 23(1):23-42.
[3]	吕古贤, 孔庆存. 胶东玲珑-焦家式金矿地质[M]. 北京: 科学出版社, 1993.
[4]	吕古贤, 邓军, 郭涛, 等. 玲珑-焦家式金矿构造变形岩相形迹大比例尺填图与构造成矿研究[J]. 地球学报, 1998, 19(2):177-186.
[5]	吕古贤, 林文蔚, 罗元华, 等. 构造物理化学与金矿成矿预测[M]. 北京: 地质出版社, 1999.
[6]	吕古贤, 郭涛, 刘杜鹃. 玲珑-焦家式金矿构造地质特征及成矿构造物理化学参量因子分析——以阜山金矿区为例[J]. 地球学报, 2002, 23(5):409.
[7]	吕古贤. 关于矿田地质学的初步探讨[J]. 地质通报, 2011, 30(4):478.
[8]	吕古贤, 武际春, 崔书学, 等. 胶东玲珑金矿田地质[M]. 北京: 科学出版社, 2013.
[9]	许亚青. 胶东构造花岗岩相分布与夏甸金矿深部成矿规律研究[D]. 北京:中国地质大学(北京),2014.
[10]	袁月蕾. 胶东构造岩浆隆起-拆离带热液蚀变成矿与典型矿床研究[D]. 北京:中国地质大学(北京),2014.
[11]	丁式江, 翟裕生, 邓军. 胶东焦家金矿蚀变岩中元素的质量迁移[J]. 地质与勘探, 2000, 36(4):28-31.
[12]	李士先, 刘长春, 安郁宏, 等. 胶东金矿地质[M]. 北京: 地质出版社, 2007.
[13]	范潇, 吕古贤, 郭涛. 焦家金矿流体的运移通道特征及其启示[J]. 矿物学报, 2011, 31(增1):467-468.
[14]	范潇, 吕古贤, 李秀章, 等. 胶西北矿集区区域断裂蚀变分带的划分和地质填图成果[J]. 矿物学报, 2013, 33(增2):761.
[15]	吴淦国, 张达, 臧文拴. 铜陵矿集区构造滑脱与分层成矿特征研究[J]. 中国科学(地球科学), 2003, 33(4):300-308.
[16]	吕古贤, 张宝林, 吕承训, 等. 长江中下游地区新华夏构造体系的“米字型”结构特征[J]. 现代地质, 2021, 35(5):1274-1281.
[17]	杨敏之, 吕古贤. 胶东绿岩带金矿地球化学[M]. 北京: 地质出版社, 1996:1-227.
[18]	吕古贤, 霍庆龙, 袁月蕾, 等. 胶东金矿陆内构造岩浆核杂岩隆起-拆离带蚀变成矿[J]. 地学前缘, 2017, 24(2):95-103.
[19]	吕承训. 胶东金矿区域构造蚀变岩带地质特征与流体成矿规律研究[D]. 北京:中国地质大学(北京), 2012.
[20]	吕承训, 吴淦国, 陈小龙, 等. 新城金矿蚀变带构造与地球化学特征[J]. 大地构造与成矿学, 2011, 35(4):617.
[21]	范潇. 焦家金矿田构造蚀变岩填图与资源量预测[D]. 北京:中国地质大学(北京), 2014.
[22]	吕古贤. 构造物理化学的研究进展[J]. 科学通报, 2003, 48(2):101-109.