Differentiating between tectonics and eustatic controls in coarse-grained, syn-rift sedimentary basins: Baja California Sur, Mexico

同裂谷三角洲的沉积结构受构造、海平面和沉积物供给（气候）变化的控制。它们通常被认为是短期海平面变化叠加在长期构造波动上的结果。圣何塞扭张盆地是构成（加州）墨西哥湾伸展区（GEP）西缘的几个盆地之一。它含有海湾早期演变（3-4 Ma）期间沉积的异常暴露的沉积物，提供了与海湾现代形态有关的最早沉积记录之一。现有的研究在当代洛雷托盆地，GEP，认识到堆叠粗粒三角洲，并建议，他们的架构是由幕式加速构造控制的沉降率，而不是海平面升降旋回。在圣何塞盆地的多学科分析将测试这一假设，并提供一个沉积结构的特征，区分构造和海平面升降控制，可以适用于其他裂谷。它也将提供重要的限制应变分布，大大有助于我们的理解应变本地化过程中向北传播的海湾。

Depositional architectures of syn-rift deltas are controlled by tectonic, eustatic, and sediment supply (climatic) variations. Most often, they are considered result from short-term eustatic variations superimposed on long-term tectonic fluctuations. The San Jose transtensional basin is one of several that form the western margin of the Gulf (of California) Extensional Province (GEP). It contains exceptionally exposed sediments deposited during the early evolution of the Gulf (3-4 Ma), providing one of the earliest records of sedimentation associated with the modern configuration of the Gulf. Existing studies in the contemporary Loreto basin, GEP, recognise stacked coarse-grained deltas, and suggest that their architecture is controlled by episodic accelerations in the rate of tectonically-controlled subsidence, rather than eustatic cyclicity. A multidisciplinary analysis in the San Jose basin would test this hypothesis, and provide a characterisation of depositional architectures to discriminate between tectonic and eustatic controls that could be applied to other rifts. It would also provide important constraints on strain distribution contributing greatly to our understanding of strain localisation during the northward propagation of the Gulf.