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本区位于山东沂沭断裂带西侧,北起沂水姚家店,南至沂南铜井一带。面积约210KM~2,该区东部属沂沭断裂带的马站——苏村拗陷,中、西部属鲁中隆断区的马牧池穹断块。本区的太古界泰山群为一套中、深变质的结晶片岩、混合岩组成本区的基底,震旦系、寒武系、奥陶系以及少量石炭系地层,构成了本区的盖层。本区中生界地层主要为白垩系的青山组火山岩系及少量王氏组地层(见图1)。 该区处于沂沭断裂带与北北西构造断裂带复合部位,白垩纪早期岩浆活动频繁,岩浆侵入及喷发作用具多期性。本区火山——侵入作用受白垩纪早期的区域性穹起作用控制,形成了穹窿构造,产生了复杂的火山机构。自白垩纪末期以来本区长期处于上升,使原古火山机构遭受剥蚀与破坏。
The area is located in the west of Shandong Yishu fault zone, Yishui Yao shop north, south to Yinan Tongjing area. The area is about 210KM ~ 2. The eastern part of this area is a horse station - Sucun depression in the Yishu fault zone and the Mamuchi dome in the middle and western part of the Luzhonglong fault zone. The Archean Taishan Group in this area is a set of middle-deep metamorphic crystalline schist and basement, Sinian, Cambrian, Ordovician and a few carboniferous strata that make up this area, . The Mesozoic strata in this area are mainly Cretaceous Qingshan Formation volcanic rocks and a small amount of Wangshi Formation (see Figure 1). The area is in the Yishu fault zone and North-northwest tectonic fault zone composite parts. Early Cretaceous magmatic activity is frequent, magmatic intrusion and eruption with a multi-period. Volcanic-intrusive activity in this area was controlled by regional domes in the early Cretaceous, forming a dome structure and generating complex volcanic structures. Since the end of the Cretaceous, the region has been on the rise for a long time, causing the erosion and destruction of the original volcano.