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、升降和沉积物供应（气候）变化的控制。大多数情况下，它们被认为是叠加在长期构造波动上的短期波动变化的结果。圣何塞张拉盆地是形成加利福尼亚湾伸展省（GEP）西部边缘的几个盆地之一。它包含在海湾早期演化（3-4 Ma）期间沉积的异常暴露的沉积物，提供了与海湾现代构造相关的最早沉积记录之一。GEP对当代Loreto盆地的现有研究发现了叠置的粗粒度三角洲，并认为它们的构造是由构造控制的沉降速率的阶段性加速控制的，而不是由上升旋回控制的。在圣何塞盆地进行的多学科分析将验证这一假设，并提供沉积结构的特征，以区分构造和升降控制，这可以应用于其他裂谷。它还将提供对菌株分布的重要约束，极大地有助于我们理解墨西哥湾向北传播过程中的菌株局部化。

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.