Determination of Early Paleozoic TTG intrusive rocks at the southeast edge of Dayao Mountain, Guangxi
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摘要: 文章对钦杭结合带西南段大瑶山东南缘地区发育的早古生代花岗岩进行了LA-ICP-MS锆石U-Pb定年和岩石学、地球化学、TTG岩石组合的研究。该系列岩体主要沿大瑶山隆起东南缘呈规模大小不等的岩株(脉)成群、成带产出,大致呈北东向弧形带状展布。按其产出的时空分布特征,可划分为2条构造-岩浆岩带:①古龙—夏郢中-晚奥陶世辉长闪长岩+TTG组合构造-岩浆岩带(445~475Ma);②罗平—古袍早志留世花岗闪长岩-花岗岩组合构造-岩浆岩带(432~436Ma)。岩石SiO2含量51.56%~73.12%,总体具低K2O、高CaO、相对富钠(Na2O>K2O)的特征;以偏铝质—弱过铝质(A/CNK值≈1)为主,岩石化学系列由低钾系列→钙碱性系列→高钾钙碱性系列演化;稀土总量低(ΣREE67.82×10-6~214.81×10-6),为弱—中等铕亏损的轻稀土富集型的稀土配分曲线特征;富集大离子亲石元素Rb、Th、U和LREE,具明显Ta、Nb负异常,总体反映了活动陆缘弧花岗岩组合的地球化学特征。结合区域地质特征分析认为,该早古生代花岗岩属典型的活动大陆边缘弧环境岩浆岩组合,以壳幔同熔I型花岗岩为主,为大瑶山东南缘早古生代洋陆俯冲-碰撞的地质记录;由TTG组合→花岗闪长岩-花岗岩组合的组成极性显示:洋俯冲玄武岩板片由南东往北西方向俯冲,其与东邻的华夏云开陆缘(由北西往南东俯冲)构成双向俯冲-碰撞的地球动力学机制。Abstract: This paper presents the zircon LA-ICP-MS U-Pb age, petrology, geochemistry and TTG intrusive rock combination of the Early Paleozoic granite from southeast edge of Dayao Mountain on the southwestern margin of Qinzhou-Hangzhou collision belt. The series of intrusive rock occurs as stocks or dikes with different sizes, which aligns in NE direction as an arc-like belt. According to the distribution of time and space, the intrusive rocks can be divided into two tectonic-magmatic belts: i.e., Gulong- Xiacheng Middle-late Ordovician gabbro diorite + TTG intrusive rock combination (445-475 Ma) and Luoping-Gupao Early Silurian granodiorite-granite rock combination (432-436 Ma). The intrusion with wide range of SiO2 (51.56%-73.12%) is mainly characterized by low K2O, high CaO and relative enrichment of Na (Na2O>K2O) and is dominated by meta-aluminum and weak peraluminum (A/CNK value ≈ 1), which exhibits evolution trends form low-K, cale-alkaline to high-K calc-alkaline series. Furthermore, the rocks have low total REE (ΣREE=67.82×10-6-214.81×10-6), showing chondrite-normalized REE patterns with weak-middle negative Eu anomalies and enrichment of light REE. In addition, the MORB normalized multi-element variation diagram clearly displays intensive enrichment of large ion lithophile elements such as Rb, Th, U and LREE and obvious depletion of Ta, Nb. These petro-geochemical characteristics indicate that the intrusive rocks belong to active continental margin granite rock combination. Combined with regional geological characteristics, the authors hold that the granite series, dominated by I-type granite with crust-mantel mixing source, is the product of typical continental margin, which recorded Early Paleozoic ocean-continent subduction-collsion event at the southeast edge of Dayao Mountain area. The polarity of the TTG intrusive rock combination and granodiorite-granite combination shows that, together with the Cathaysia Yunkai continental margin (subducting from northwest to southeast) adjacent to the east of Dayao Mountain, the oceanic subducation basalt slab, subducting from southeast to northwest, constitutes a bi-directional subduction-collision geodynamic mechanism.
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