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溧水火山岩地区位于长江下游南岸,东邻茅山山脉,西接宁芜火山岩盆地,是长江中下游一系列中生代陆相火山岩分布区之一。该区火山岩系,按喷发次序、岩石组合、喷发间断等,自下而上,可以划分为四个火山喷发旋回,即龙王山旋回,主要由中—基性熔岩、次火山岩和相应的火山碎屑岩组成,东芦山旋回,主要由中碱性和基性熔岩、次火山岩及相应的火山碎屑岩组成,观山旋回,主要由中碱性—碱性熔岩、次火山岩及火山碎屑岩组成;甲山旋回,全部由酸性熔岩、次火山岩及火山碎屑岩组成。有关各旋回的主要岩石类型和主要火山岩的岩石化学成份见表1、2。
Lishui volcanic area is located in the south bank of the lower reaches of the Yangtze River, east of Maoshan mountains, west Ninghu volcanic basin, is a series of Mesozoic continental volcanic rock distribution area in the middle and lower reaches of the Yangtze River. The volcanic rocks of this area can be divided into four volcanic eruption cycles according to eruption sequence, rock assemblage and eruption intermittent, ie, the rotation of the Longwangshan Mountains, which is mainly composed of medium-basic lavas, sub-volcanic rocks and volcanic fragments The composition of the crustal rocks and the rotation of the Donglu Mountain are mainly composed of medium-alkaline and basic lavas, sub-volcanic rocks and corresponding volcaniclastic rocks, which are mainly cyclones from the alkaline-alkaline lavas, subvolcanic rocks and pyroclastic rocks Composition; A mountain cycle, all from the acidic lava, sub-volcanic rocks and pyroclastic rocks. Rock chemistry of the major rock types and major volcanic rocks of each cycle are shown in Tables 1 and 2.