Abstract U Pb geochronology along a north-south transect from central Sonora to northern Sinaloa in northwestern Mexico indicates several changes in provenance sources through time and space. Lower Cambrian arenites of the Proveedora Quartzite yield a single main age peak at 1075 Ma with minor Paleoproterozoic contribution. Arenites from the Sonobari Complex of southwestern Sonora-northwestern Sinaloa, purportedly assigned to the early Paleozoic, yield main peaks at 1424, 1662, and 1736 Ma, probably derived from the Yavapai and Mazatzal provinces, which are pervasively intruded by early Mesoproterozoic granites coeval to those forming the Granite-Rhyolite Province. Lower to Upper Ordovician units deposited on shelf, slope, and abyssal environments display very similar zircon age patterns, with main peaks ca. 2700 and 1850 Ma, indicating a large drainage system arising from the Archean cratons of Laurentia such as the Wyoming or Superior Provinces, and Paleoproterozoic sources similar to the Trans-Hudsonian orogen, which are older than the Yavapai Province. The Rio Fuerte quartzites from southern Sonora-northern Sinaloa contain main peaks at 534, 542, and 637 Ma whose sources may be peri-Gondwanan blocks similar to Avalonia or Carolina terranes. A minor peak at 475 Ma suggests input from igneous suites reported from the Acatlan Complex in southern Mexico. U Pb geochronology permit inference of a late Paleozoic collisional orogen in northwestern Mexico that was originated by the collision of Gondwanan blocks against southern Laurentia and outline the boundary between terranes related to continental blocks in the Pangaea supercontinent.

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从碎屑锆石数据看墨西哥西北部冈瓦纳大陆的北部界限

摘要 沿从索诺拉州中部到墨西哥西北部锡那罗亚州北部的南北横断面的 U Pb 年代学表明物源在时间和空间上的若干变化。Proveedora 石英岩的下寒武统砂岩在 1075 Ma 处产生一个单一的主要时代峰，具有较小的古元古代贡献。来自索诺拉州西南部-锡那罗亚西北部的 Sonobari 杂岩群的 Arenites，据称属于早古生代，在 1424、1662 和 1736 Ma 产生主峰，可能来自 Yavapai 和 Mazatzal 省，它们普遍被早期中元古代花岗岩共侵入那些形成花岗岩-流纹岩省的人。沉积在陆架、斜坡和深海环境中的下至上奥陶统单元显示出非常相似的锆石年龄模式，主峰约。2700 和 1850 毫安，表明一个大型排水系统起源于 Laurentia 太古宙克拉通，例如怀俄明州或苏必利尔省，以及类似于 Trans-Hudsonian 造山带的古元古代源，它们比 Yavapai 省更古老。来自索诺拉州南部 - 锡那罗亚州北部的 Rio Fuerte 石英岩在 534、542 和 637 Ma 包含主峰，其来源可能是类似于 Avalonia 或 Carolina 地体的冈瓦纳周围地块。475 Ma 的小峰值表明来自墨西哥南部 Acatlan Complex 报告的火成岩套的输入。U Pb 年代学允许推断墨西哥西北部的晚古生代碰撞造山带，该造山带起源于冈瓦纳地块与劳伦西亚南部的碰撞，并勾勒出与盘古超大陆大陆地块相关的地体之间的边界。