Oxygen, carbon, and strontium isotope variations in vein-filling calcite and quartz cements and their host rocks are used to elucidate the origin, spatial and temporal evolution, and migration pathways of fluids in the detachment Nuncios fold complex, northeastern Mexico. The folded Mesozoic sedimentary sequence contains two regional paleohydrostratigraphic units separated by a unit of low perm...

Exceptionally preserved fossil biotas of the Burgess Shale and a handful of other similar Cambrian deposits provide rare but critical insights into the early diversification of animals. The extraordinary preservation of labile tissues in these geographically widespread but temporally restricted soft-bodied fossil assemblages has remained enigmatic since Walcott's initial discovery in 1909. Here...

Studying the diagenesis of island carbonates can be hampered by difficulty accurately constraining mineral formation temperature. The carbonate clumped isotope composition (measured as ?47 value) is based on temperature-dependent binding 13C to 18O, and offers a promising means calculating In this study, we report values from ~1 km-long drill core Meiji Reef in South China Sea, which are integr...

The Curiosity rover in Gale crater is investigating a mineral transition observed from orbit – an older “clay unit” to younger “sulfate hypothesized reflect the aridification of Mars’ climate. Below this transition, detected crystalline Ca-sulfates with minor Fe-sulfates but also found that some fraction rock’s bulk SO3 often poorly constrained X-ray amorphous component. Here, we characterize a...

The Sa’adi Formation is a part of the late Cretaceous period in Santonian-Campanian stage that represents potential hydrocarbon-bearing reservoir across many oilfields Mesopotamian Basin, South Iraq. was divided into two main parts as stratigraphy sequence. It consists chalky limestone with argillaceous upper and marly lower part. considered an important stratigraphic unit marked by petroleum s...