拟建中国遂宁地质公园地质遗迹资源特色及成因分析

拟建中国遂宁地质公园位于四川盆地中部腹地,处于川中平缓褶皱带,侏罗纪地层层序发育相对完整,广泛出露侏罗系中统沙溪庙组、侏罗系上统遂宁组和蓬莱镇组地层。公园地形东部较高,逐渐向西北倾伏,总体构造方向近东西向,在大地构造上属于蓬莱镇背斜中段北翼,以发育构造变形幅度较小的平缓褶皱构造为主,断裂构造较少发育,天然气、岩盐、卤水等沉积矿产丰富。古生物化石、地层剖面和重要采矿遗址成为了公园三大主导地质遗迹。本文通过对公园内古生物化石、地层剖面和盐卤资源的成因进行分析研究,从区域地层年代划分、地层对比,古环境、古地理、古气候重建,探究四川盆地侏罗纪古地理格局与古生态环境变迁、古生物演化等方面,为提升地质公园的科学内涵与科研价值、发挥其科学普及功能提供重要的参考资料。

Geoheritages and Their Genesis of the Proposed Suining National Geopark

The proposed Suining National Geopark is located in the midland hinterland of the Sichuan basin, lying in the central Sichuan gentle fold belt where the Second Member of the Middle Jurassic Shaximiao Formation and the Upper Jurassic Suining and Penglai Formations are widely exposed. Tectonically, the Suining Geopark lies in the north limb of the Penglaizhen anticline and is characterized by simple gently folded structure. The area of the geopark is rich in gas, rock salt and brine. Its geoheritages are composed of stratigraphic profile, fossils and important mining sites. This paper has a discussion on regional geological evolutionary history of the area of the geopark during the Middle and Late Triassic and Early Jurassic, formation of silicified wood and genesis of rock salt and brine.