西藏拉萨地块东部南缘昌果地区典中组火山岩的年代学、地球化学及成因
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摘要
林子宗群火山岩被认为是新特提斯洋消亡到印度与欧亚大陆碰撞过程的产物。前人对林子宗群火山岩进行了大量的研究工作,并取得了丰硕的成果,但在拉萨地块东部地区的研究仅限于林周盆地周围,而拉萨地块东部南缘地区的研究尚处于空白状态。本文首次对拉萨地块东部南缘昌果地区林子宗群典中组火山岩进行了年代学、全岩地球化学和Sr-Nd同位素研究。结果表明,典中组火山岩(14DST-23、14DST-25)锆石LA-ICP-MS U-Pb年龄分别为(69.97?0.45) Ma、(66.80?1.10) Ma;岩性主要为中性的安山岩、粗安岩,夹少量的酸性流纹岩,属钙碱性-高钾钙碱性系列;富集大离子亲石元素,亏损高场强元素,具有明显的Nb、Ta、Ti负异常,显示典型弧火山岩的特征; Sr-Nd同位素组成上,中性岩的初始87Sr/86Sr比值为0.703980, 143Nd/144Nd比值为0.512864,εNd(t)值为5.1。以上特征暗示昌果地区典中组中性火山岩可能形成于新特提斯洋俯冲过程中亏损地幔源区的部分熔融。昌果地区典中组火山岩具有大陆边缘弧火山岩的特征,应形成于俯冲的岛弧环境。
The volcanic rocks of the Linzizong Group are regarded as the product of the disappearance of the Neo Tethys Ocean during the collisional process between India and Eurasia. A large number of research studies of the volcanic rocks of the Linzizong Group have been completed achieving fruitful results. however, research in the eastern region of the Lhasa Block is limited to the area surrounding the Linzhou Basin. In addition, research along the southern margin of the Lhasa Block has not been completed. First, a systematic study of the geochronologic, major and trace element geochemical, and Sr-Nd isotopic data of the Dianzhong Formation volcanic rocks in the Changguo area of the southeastern Lhasa Block. The results indicate that the LA-ICP-MS zircon U-Pb age of the Dianzhong Formation(14 DST-23 and 14 DST-25) in the Changguo area is(69.97±0.45) Ma and(66.80±1.10) Ma; the formation is mainly neutral andesite and trachyandesite, with a small amount of acidic rhyolite, is a calc-alkalic and high-potassic calc-alkalic series; it is relatively enriched in large-ion lithophile elements, depleted in high field strength elements, and has negative Nd, Ta and Ti anomalies, showing characteristics of typical of arcvolcanic rocks; and for Sr-Nd isotopic compositions, the intermediate rocks have an initialized 87 Sr/86 Sr ratio = 0.70398 and a 143 Nd/144 Nd ratio = 0.51286, εNd(t) = 5.1. The aforementioned features suggest that the Dianzhong Formation volcanic rocks in the Changguo area may have formed from the partial melting of a depleted mantle source during subduction of the Neo Tethys Ocean. The volcanic rocks of the Dianzhong Formation in the Changguo area are characterized by continental marginal arc volcanic rocks and formed in a subduction island arc environment.
The volcanic rocks of the Linzizong Group are regarded as the product of the disappearance of the Neo Tethys Ocean during the collisional process between India and Eurasia. A large number of research studies of the volcanic rocks of the Linzizong Group have been completed achieving fruitful results. however, research in the eastern region of the Lhasa Block is limited to the area surrounding the Linzhou Basin. In addition, research along the southern margin of the Lhasa Block has not been completed. First, a systematic study of the geochronologic, major and trace element geochemical, and Sr-Nd isotopic data of the Dianzhong Formation volcanic rocks in the Changguo area of the southeastern Lhasa Block. The results indicate that the LA-ICP-MS zircon U-Pb age of the Dianzhong Formation(14 DST-23 and 14 DST-25) in the Changguo area is(69.97±0.45) Ma and(66.80±1.10) Ma; the formation is mainly neutral andesite and trachyandesite, with a small amount of acidic rhyolite, is a calc-alkalic and high-potassic calc-alkalic series; it is relatively enriched in large-ion lithophile elements, depleted in high field strength elements, and has negative Nd, Ta and Ti anomalies, showing characteristics of typical of arcvolcanic rocks; and for Sr-Nd isotopic compositions, the intermediate rocks have an initialized 87 Sr/86 Sr ratio = 0.70398 and a 143 Nd/144 Nd ratio = 0.51286, εNd(t) = 5.1. The aforementioned features suggest that the Dianzhong Formation volcanic rocks in the Changguo area may have formed from the partial melting of a depleted mantle source during subduction of the Neo Tethys Ocean. The volcanic rocks of the Dianzhong Formation in the Changguo area are characterized by continental marginal arc volcanic rocks and formed in a subduction island arc environment.
引文
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