This contribution deals first new ICP-MS U–Pb zircon ages that indicate Middle- and Late Triassic magmatic episode and tectonometamorphic events, respectively, for the central Patagonia region, instead of a Paleozoic history as previously estimated. The Calcatapul Formation consists of a (meta-) volcano-sedimentary syn-rift sequence deposited unconformably, shortly after the extensional Gondwanide orogenic collapse, over a basement composed of Permian granites. Two ²⁰⁶Pb/²³⁸U ages yielded 245.1 ± 2.8 and 244.8 ± 4.1 Ma to magmatic crystallization of ignimbrites, along with another weighted mean of 226.7 ± 4.4 Ma interpreted as the age of the tectonometamorphic event D₁-M₁ affecting the Calcatapul sequence. U–Pb ages open new insights into the tectonomagmatic evolution of the area because the syn-rift wedge deposited in the Uribe and Yancamil half-grabens under the extensional tectonic regime was then inverted along the basin-bounding faults like the Yancamil fault. Inversion tectonics involved reverse fault-related uplift against a buttress of the rigid granitic block, and under dynamic greenschist-to-amphibolite facies metamorphic conditions, before the Late-Triassic granitic magmatism of the Lipetrén Suite took place. The pre-rift granitic basement represents the southern extension of the main magmatic phase of Choiyoi Province in Patagonia, whereas the Middle Triassic recorded the extensional, post-Choiyoi magmatism. The local, compressive D₁ event punctuated an overall widespread lithospheric extension that leads to Gondwana breakup since the earliest Jurassic times.

该贡献处理了第一个新的ICP-MS U–Pb锆石年龄，该年龄分别指示了巴塔哥尼亚中部地区的三叠纪中晚期和岩浆事件和构造变质事件，而不是先前估计的古生代历史。卡尔卡塔普尔组由（二元）火山沉积的同裂陷层序列组成，该序列在二叠纪花岗岩构成的基底上不均匀地沉积，该沉积在伸展的冈瓦德造山带塌陷后不久。两个²⁰⁶ Pb / ²³⁸ U年龄对岩浆岩的岩浆结晶产生了245.1±2.8和244.8±4.1 Ma，另外一个加权平均值226.7±4.4 Ma被解释为构造变态事件的年龄D ₁ -M ₁影响Calcatapul序列。U–Pb年龄为该地区的构造学演化开辟了新的见识，因为沉积在伸展构造政权下的乌里韦和扬卡米尔半岩中的同裂谷楔随后沿沿盆地边界的断层（如扬卡米尔断裂）倒转了。反转构造涉及在LipetrénSuite的晚三叠世花岗岩岩浆作用发生之前，与逆断层有关的隆起作用，作用在坚硬的花岗岩块的支撑上，并且处于动态的绿岩-闪石相变质条件下。裂谷前的花岗岩基底代表了巴塔哥尼亚Choiyoi省主要岩浆相的南部延伸，而中三叠纪记录了Choiyoi后的岩浆活动。局部压缩D ₁ 这次事件标志着整个岩石圈的广泛扩张，导致最早的侏罗纪以来冈瓦纳解体。