Bottom simulating reflections (BSRs) interpreted in seismic data are one of the most used indicators for presence gas hydrates. In numerous hydrate provinces, including Hikurangi margin, east New Zealand, distinct and anomalous gaps reflectivity punctuate otherwise continuous BSRs. We undertake a stratigraphic structural interpretation dense grid two-dimensional reflection to investigate possib...

Deformation measurements from 64 sandstone samples collected in three study areas from the Eastern Belt of the Franciscan Complex are used to evaluate how the high­ pressure metamorphic interior of the Franciscan wedge was exhumed. Pressure estimates indicate 25-30 km of exhumation in this part of the Franciscan Complex. Much of the Eastern Belt has a semi-penetrative cleavage that formed by so...

Accretionary prisms are mainly composed of ancient marine sediment scraped from the subducting oceanic plate at a convergent plate boundary. Large amounts of anaerobic groundwater and natural gas, mainly methane (CH4) and nitrogen gas (N2), are present in the deep aquifers associated with an accretionary prism; however, the origins of these gases are poorly understood. We herein revealed region...

Multichannel seismic-reflection data collected on the Peru margin as part of Leg 112 of the Ocean Drilling Program predrilling site survey define some tectonic and sedimentary features of the Lima and Yaquina basins. A narrow accretionary prism is imaged at the toe of the trench slope in both areas. Landward of the accretionary prism is a transition zone that may be underlain by older accreted ...

Abstract We propose a conceptual geological model for the collision of multiple basement topographic highs (BTHs; e.g., seamounts, ridges, and horsts) with forearc accretionary wedge. Even though there are many BTHs on an oceanic plate, few examples modeling BTHs. conducted numerical simulations using discrete element method to examine effects three BTH collisions forearcs. The typical structur...

Deciphering the exhumation mechanism of high-pressure−low-temperature (HP-LT) metamorphic rocks can provide important insights into tectonic evolution oceanic subduction zones at active continental margins. Here, we present a multidisciplinary study examining tectonics Permo−Triassic eclogite-bearing HP-LT terranes Central Qiangtang belt (CQMB) in central Tibetan Plateau. Field geological relat...