Depositional Architecture and Evolution of Late Permian Reefs in Ziyun County,Southern Guizhou, China

The uppermost Permian reef complex in Ziyun County, southern Guizhou occurs as a third-order depositional sequence developed in the platform marginal break zone during the Late Permian transgressive period This paper deals with the evolution of the third-order sequence and depositional arthitecture of the sequence stratigraphic units with the analysis of outcrop sequence stratigraphy and chemostratigraphy. Thirteen parasequences which belong to four system tracts are recognized. According to their genetic facies features,three growth strategies of reef accrete from the systems tracts during sea level changes are distinguished as keep-up reefs, give-up reefs and catch-up reefs. In combination with an absolute water depth analysis by chemostratigraphic method, we establish an entire sea level curve of the third-order sequence and discuss its evolution and depositional response.

Circum-Indian Holocene sea-level database:A repository of distinct relative sea-level plots across the Indian Peninsula

The Indian Peninsula is one of the most well-studied regions for Holocene sea-level fluctuations in the world, however, standardized relative sea-level datasets are missing. This study provides an archive of sealevel indicators(n = 162, 20 locations) along the western and the eastern sides of the peninsula, that have been used to develop Relative Sea Level(RSL) plots. Each dated sea-level indicator is recalibrated for its elevation based on tidal and tectonic correction, as well as age with reservoir correction, and have been separated into six zones based on coastal geomorphology and number of datasets. The database spans throughout the Holocene and covers sea-level depth/elevations from-45 m to +5 m from mean sea-level(MSL). Approximately 90 % of the dataset range from 8 ka to the present day. The first transgression is highly variable and identified between 8.5-8 ka BP in Gujarat(Zone 1), ~ 5.5 ka BP in Maharashtra(Zone 2), between 8 and 7 ka BP in Tamil Nadu(Zone 4) and between 8 and 7.5 ka BP in the Bengal coasts(Zone 6). No transgression above present sea-level is observed along Andhra Pradesh(Zone 5)(no data for Kerala-Zone 3).Further, Zones 1, 2, 4 and 6 show a strong uplift component(tectonic), whereas Zone 5 exhibits subsidence during the Holocene(Zone 3-insufficient data). Based on these findings, and given the region's coastal topography and tidal components, Zones 6 and 1 will likely undergo the largest coastal inundation, followed by Zones 5, 4, 2, and 3. These insights are critical in planning future coastal inundation measures across the Indian Peninsula.

Design principle of S-scheme heterojunction photocatalyst

Recently,a new opinion was put forward on general design standards for S-scheme heterojunction photocatalyst.Four types of S-scheme heterojunctions were analyzed.Specifically,the critical understanding on the curved Fermi level at the interface of S-scheme heterojunction is helpful to strengthen and promote the basic theory of photocatalysis.