The Claromecó foreland Basin (Carboniferous–Permian; southern Buenos Aires province, Argentina) is key to understanding the paleotectonic evolution of the southwestern Gondwana margin and is relevant to energy resource exploration. This study reconstructs the thermal and burial history of the Claromecó Basin by integrating geochemical data, organic petrology, and thermal modeling techniques. Cores samples of the Tunas Formation (Pillahuincó Group, Early Permian) were studied. A 1D thermal model was constructed, calibrated with vitrinite reflectance measurements (VRo %), and corroborated with fluid inclusion and apatite fission track data from previous studies. Rock-Eval pyrolysis results show TOC% values ranging from 0.13 to 60.35 wt%. The Hydrogen index (HI < 50 mg HC/g TOC) and Oxygen index (OI < 50 mg CO/g TOC) indicate the dominance of Type III and Type IV kerogens, most likely resulting from the thermal maturation of an original Type III kerogen. Petrologic observations confirm the presence of macerals from the inertinite group, as well as minor amounts of vitrinite and liptinite. The Tmax displays a temperature range mostly from 460 to 610 °C. The VRo % values range from 1.5 to 2.0%. Geochemical data combined with VRo % measurements confirm a late catagenesis to metagenesis stage within the wet to dry gas window for coals and organic-rich strata.

中文翻译：

---

通过结合有机地球化学、有机岩石学和热模拟，了解晚古生代 Claromecó 前陆盆地（阿根廷冈瓦纳西南部）的埋藏历史和油气潜力


克拉罗梅科前陆盆地（石炭纪-二叠纪；阿根廷布宜诺斯艾利斯省南部）是了解西南冈瓦纳边缘古构造演化的关键，与能源资源勘探相关。这项研究通过整合地球化学数据、有机岩石学和热模拟技术，重建了克拉罗梅科盆地的热和埋藏历史。对金枪鱼地层（Pillahuincó 群，早二叠世）的岩心样本进行了研究。构建了一维热模型，用镜质体反射率测量值 (VRo %) 进行校准，并用先前研究中的流体包裹体和磷灰石裂变径迹数据进行证实。 Rock-Eval 热解结果显示 TOC% 值范围为 0.13 至 60.35 wt%。氢指数 (HI < 50 mg HC/g TOC) 和氧指数 (OI < 50 mg CO/g TOC) 表明 III 型和 IV 型干酪根占主导地位，很可能是由于原始 III 型干酪根的热成熟造成的。岩石学观察证实了惰性岩组显微组分的存在，以及少量的镜质体和脂质体。 Tmax 显示的温度范围大多为 460 至 610 °C。 VRo % 值范围为 1.5 至 2.0%。地球化学数据与 VRo % 测量相结合，证实了煤和富含有机物地层在湿到干气体窗口内的晚期还原到变生成阶段。