CAJ | 학술논문

太行山中段左权羊角镇发育新生代玄武岩,记录了太行山新生代以来的构造隆升事件.在详细的野外调查和研究的基础上,通过与玄武岩发育相关的地貌面及其上的地层特征分析,初步确定该玄武岩是上新世末期到早更新世初期的喷发产物,初步揭示了太行山中段区域上晚上新世以来地貌发育历史,主要存在6次构造隆升与剥蚀期:在唐县期宽谷面形成的基础上,于上新世晚期存在一次隆升和一次稳定侵蚀期,并侵蚀形成"U"形谷;早更新世初,玄武岩开始间歇性喷发,同时发生以西武家坪为中心的地区上拱,"U"形谷为玄武岩充填,之后经剥蚀堆积形成第四级阶地面;早更新世末,该区再次发生隆升,并形成第四级阶地:中更新世末,该区发生隆升,形成第三级阶地;晚更新世以来,太行山中段又连续发生两次抬升,从而在玄武岩体上形成了4级阶地,形成太行山现今地貌.研究同时表明,太行山中段上新世晚期以来的隆升主要发生于上新世末到早更新世时期.这一认识为探讨太行山中段晚上新世以来的构造隆升提供了具体证据.
태행산중단좌권양각진발육신생대현무암,기록료태행산신생대이래적구조륭승사건.재상세적야외조사화연구적기출상,통과여현무암발육상관적지모면급기상적지층특정분석,초보학정해현무암시상신세말기도조경신세초기적분발산물,초보게시료태행산중단구역상만상신세이래지모발육역사,주요존재6차구조륭승여박식기:재당현기관곡면형성적기출상,우상신세만기존재일차륭승화일차은정침식기,병침식형성"U"형곡;조경신세초,현무암개시간헐성분발,동시발생이서무가평위중심적지구상공,"U"형곡위현무암충전,지후경박식퇴적형성제사급계지면;조경신세말,해구재차발생륭승,병형성제사급계지:중경신세말,해구발생륭승,형성제삼급계지;만경신세이래,태행산중단우련속발생량차태승,종이재현무암체상형성료4급계지,형성태행산현금지모.연구동시표명,태행산중단상신세만기이래적륭승주요발생우상신세말도조경신세시기.저일인식위탐토태행산중단만상신세이래적구조륭승제공료구체증거.
The uplift events have been recorded by the basalt around Yangjiao Town of Zuoquan County in middle Taihang Mountains since the end of Pliocene. Based on field investigation, the authors studied the morphologic characteristics of the basalt and the related topographic surface, and detected that the basalt was formed between the end of Pliocene and the beginning of Early Pleistocene. The geomorphic evolution of the middle Taihang Mountains since Late Pliocene is as follows: in Late Pliocene, this area underwent two phases of geomorphic evolution, i.e., uplift and erosion, and this led to the formation of the "U" valley; at the end of Pliocene, because of the repeated and intermittent eruption of the basalt and the uplift of the geomorphic surface of the middle Taihang Mountains centered at Wujiaping Village, the basalt filled the "U" valley, and then the geomorphic surface of the fourth terrace was formed through erosion and accumulation; in Early Pleistocene, the geomorphic surface of the middle Taihang Mountains was uplifted so that the fourth step terrace was formed. At the end of Middle Pleistocene, the third terrace was formed; Since Late Pleistocene, two times of uplifting of the geomorphic surface took place, and hence all of the four steps of terraces came into being on the basalt. It is shown that the uplift of the middle Taihang Mountains occurred mainly between the end of Pliocene and Early Pleistocene. This cognition offers material evidence for the uplift of the middle Taihang Mountains since Late Pliocene.