据认,科迪勒拉冒地槽的下到中古生代碳酸盐岩是陆棚沉积。它的东部代表浅水沉积环境;它的西部代表外陆棚上较深水的环境。在这种陆棚碳酸盐岩层范围内,灰岩和白云岩的时空分布具有稳定的型式。中内华达东面的下到中古生代碳酸盐岩主要是白云岩,而西面的主要是灰岩(图1)。西面的 It is believed that the Lower-Middle Paleozoic carbonate rocks from Cordillera Basin are continental shelf sediments. Its eastern part represents the shallow water sedimentary environment; its western part represents the deeper water of the outlying shelter. Within the framework of this continental shelf carbonate, the spatiotemporal distribution of limestone and dolomite has a stable pattern. The Lower-Middle Paleozoic carbonates to the east of Nevada are mainly dolomite, while the west is dominated by limestone (Figure 1). West