CAJ | 학술논문

望果山组是发育在龙木错-双湖-澜沧江板块缝合带内的一套早石炭世基性-酸性火山岩沉积地层，以火山角砾岩、火山凝灰岩、安山岩及流纹岩为主，夹少量玄武岩，具有多旋回式喷发的特点，被下石炭统日湾茶卡组整合覆盖，总体为一套近火山口相的海相火山岩沉积地层，表现出扬子型地层的亲缘性。在青山梁地区获得的望果山组安山岩的LA-ICP-MS锆石U-Pb年龄为350Ma±1Ma，结合下石炭统日湾茶卡组砂岩碎屑锆石的最年轻年龄峰值（362Ma），认为望果山组应形成于早石炭世杜内阶。望果山组的建立对龙木错-双湖构造地层区地层系统的完善，以及探讨龙木错-双湖-澜沧江洋的演化历史等具有重要的地质意义。
망과산조시발육재룡목착-쌍호-란창강판괴봉합대내적일투조석탄세기성-산성화산암침적지층，이화산각력암、화산응회암、안산암급류문암위주，협소량현무암，구유다선회식분발적특점，피하석탄통일만다잡조정합복개，총체위일투근화산구상적해상화산암침적지층，표현출양자형지층적친연성。재청산량지구획득적망과산조안산암적LA-ICP-MS고석U-Pb년령위350Ma±1Ma，결합하석탄통일만다잡조사암쇄설고석적최년경년령봉치（362Ma），인위망과산조응형성우조석탄세두내계。망과산조적건립대룡목착-쌍호구조지층구지층계통적완선，이급탐토룡목착-쌍호-란창강양적연화역사등구유중요적지질의의。
The Wangguoshan Formation developed in the Lungmu Co-Shuanghu Lake-Lancang River suture zone is a suite of Early Carboniferous basic-acid volcanic sedimentary strata consisting of volcanic breccia,volcanic tuff,andesite,rhyolite and minor basalt, has the features of polycyclic eruption,and is conformably overlain by the Early Carboniferous Riwanchaka Formation. On the whole, these strata are a set of marine facies volcanic sedimentary strata near the volcanic vent and exhibit Yangtze attribute. The andsesite of the Wangguoshan Formation in the Qingshanliang area has a LA-ICP-MS U-Pb zircon concordia age of 350Ma ± 1Ma. In combination with the youngest peak numerical value of sandstone detrital zircon in the Early Carboniferous Riwanchaka Formation, the authors hold that the Wangguoshan Formation should have been formed in the Early Carboniferous Tournaisian. The establishment of the Wangguoshan Formation has important geological significance for the completion of the stratigraphic system in Lungmu Co-Shuanghu tectonic-stratigraphic area and the discussion of the evolutionary history of the Lungmu Co-Shuanghu-Lancang River Ocean.