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本文重新对闽南—粤东地区的大地构造单元进行了划分,把原来所谓“华夏古陆”的东部定为华力西褶皱带,西部仍称加里东期的华夏隆起带。对中生代地壳运动及构造,明确提出,把燕山旋迴分为早燕山期、中燕山期、晚燕山期。该区与富铁矿形成关系最密切的是中燕山期的断裂岩浆活动。通过对基底与盖层构造变动关系的研究,首先发现在大田—上杭—连平,以北东向延伸的一线,为加里东褶皱基底隆起与基底坳陷的分界线。其东南为加里东基底坳陷区,其上晚古生代盖层叠加中燕山期断裂岩浆活动地段是寻找富铁矿重要部位;其北西为加里东基底的隆起区,其上晚古生代盖层叠加中燕山期断裂岩浆活动地段是寻找多金属矿的重要地区。本文以区域构造背景的研究为依据,对富铁矿的形成同意接触交代(部分为热液再造)成因的观点。
In this paper, the tectonic units in the southern Fujian-eastern Guangdong area are re-classified. The eastern part of the so-called “Huaxia Ancient Land” is defined as the Variscan fold belt, while the western part of the Caledonian Huaxia uplift belt is still called. The Mesozoic crustal movement and structure, made it clear that the Yanshan cycle is divided into early Yanshan period, the Yanshan period, late Yanshan period. The most closely related to the formation of iron-rich ore in this area is the fracture magmatism during the middle Yanshan period. Based on the study of the relationship between basement and caprock structure variation, we first found a line extending in the direction of Daejeon-Shanghang-Lianping to the northeast, which is the dividing line between the basement uplift and the uplift of the Kalidong fold. The southeast is the Caledonian basement depression area. The Upper Paleozoic overlying magmatic superimposed with the middle Yanshan fault magmatic activity area is an important part of locating the iron-rich ore. The northwest is uplift area of the Caledonian basement. The Upper Paleozoic overburden The Yanshanian fault magmatic activity area is an important area looking for polymetallic ore. Based on the study of the regional tectonic setting, this paper gives the view that the formation of iron-rich ore deposits agrees with the genesis of contact (partly hydrothermal rebuild).