18 Works

Pore scale in situ imaging of multiphase flow at steady-state for an altered mixed-wet Bentheimer sandstone

Shuangemei Zou, Yang Liu, Jianchao Cai & Ryan Armstrong
The data sets contains in situ imaged fluid distribitions for two-phase drainage at four fractional flows under steady state condition for a water-wet Bentheimer sandstone and an altered mixed-wet Bentheimer sandstone. These multiphase images are used for curvature measurement and relative permeability measurement for two wettability conditions while dry images are used for porosity and absolute permeability measurements. Further details on experimental protocols can be found in Zou (2018,2019). Data was acquired at the University...

The Influence Law of Eccentric Load on the Performance of Yielding Bolt

Yang Tai, Hongchun Xia, Shaopin Huang, Jie Meng & Wei Li
In order to adapt high stress and large deformation of roadways, the prestressed yielding bolt has been developed. However, borehole deviation makes the boreholes out of perpendicular to the roadway surface, and the prestressed yielding bolt will be under eccentric load. In order to reveal the influence laws of eccentric load on the performance of the prestressed yielding bolt, the numerical simulation was carried out in this paper. Then, the influence of eccentric load on...

Portable smartphone integrated paper sensors for fluorescence detection of As(III) in groundwater

Yong Li
Arsenic contamination in groundwater is a supreme environmental problem, and levels of this toxic metalloid must be strictly monitored by a portable, sensitive and selective analytical device. Herein, a new system of smartphone integrated paper sensors with Cu nanoclusters was established for the effective detection of As(III) in groundwater. For the integration system, the fluorescence emissive peak of Cu nanoclusters at 600 nm decreased gradually with increasing As(III) addition. Meanwhile, the fluorescence color also changed...

Deciphering linkages between microbial communities and priming effects in lake sediments with different salinity

Jian Yang, Yao Chen, Weiyu She, Haiyi Xiao, Zheng Wang, Huanye Wang, Weiguo Liu & Hongchen Jiang
Priming effects (PEs) and their associated microbial drivers are not well studied in lake sediments. Here, we investigated PEs and underlying potential microbial drivers in the sediments of lakes on the Qinghai-Tibetan Plateau (QTP). Sediments were collected from three QTP lakes with different salinity, followed by microcosm construction and subsequent incubation at in-situ temperature. The sediment microcosms were amended with 13C-labeled glucose, on which PE intensities were evaluated in the incubations on the 7th and...

Supplementary data from: Decoupling of morphological disparity and taxonomic diversity during the end-Permian mass extinction

Junyu Wan, William Foster, Li Tian, Thomas Stubbs, Michael Benton, Xincheng Qiu & Aihua Yuan
An increasing number of unexpectedly diverse benthic communities are being reported from microbially-precipitated carbonate facies in shallow-marine platform settings after the end-Permian mass extinction. Ostracoda, which was one of the most diverse and abundant metazoan groups during this interval, recorded their greatest diversity and abundance associated with these facies. Previous studies, however, focused mainly on their taxonomic diversity and, therefore, left room for discussion of paleoecological significance. Here, we apply a morphometric method (semi-landmarks) to...

Estimating leaf nitrogen concentration based on the combination with fluorescence spectrum and first-derivative

Jian Yang, Lin Du, Wei Gong, Shuo Shi & Jia Sun
Leaf nitrogen concentration (LNC) is a major indicator in the estimation of the crop growth status which has been diffusely applied in remote sensing. Thus, it is important to accurately obtain LNC by using passive or active technology. Laser-induced fluorescence (LIF) can be applied to monitor LNC in crops through analyzing the changing of fluorescence spectral information. Thus, the performance of fluorescence spectrum (FS) and first-derivative fluorescence spectrum (FDFS) for paddy rice (Yangliangyou 6 and...

Carbon fixation by photosynthetic mats along a temperature gradient in a Tengchong hot spring

Yidi Zhang
Geothermal hot springs, widely distributed on Earth, are important geological green-house gas sources which contribute large amounts of CO2 emission to the atmosphere. Exploring microbial carbon fixation in these springs is vital to fully understand the carbon budget in these terrestrial aquatic systems. In this study, carbon fixation rate by photosynthetic mats was determined with a 13C labeling approach along a gradient of temperature (~69 - ~75 oC) in a geothermal pool at Rehai Park...

A new Changhsingian (Lopingian) brachiopod fauna of the shallow-water clastic-shelf facies from Fujian Province, southeastern China

Huiting Wu, Yang Zhang, Thomas Stubbs, Jingqi Liu & Yuanlin Sun
Although much attention has been paid to Changhsingian brachiopods in South China, there are only two Chinese studies, published in 1979 and 1990, on Changhsingian brachiopods from the southeastern part of South China. Based on systematically collected fossil material, this paper describes and quantitatively analyses a Changhsingian brachiopod fauna from the Luokeng Formation at the Hongtian section, Fujian Province, southeastern China, for the first time. Among the brachiopods (30 species in 18 genera) described and...

Verifiability of genus-level classification under quantification and parsimony theories: a case study of follicucullid radiolarians

Yifan Xiao, Noritoshi Suzuki, Weihong He, Michael Benton, Tinglu Yang & Chenyang Cai
The classical taxonomy of fossil invertebrates is based on subjective judgments of morphology, which can cause confusion since there are no codified standards for the classification of genera. Here, we explore the validity of the genus taxonomy of 75 species and morphospecies of the Follicucullidae, a Late Paleozoic family of radiolarians, using a new method, Hayashi’s quantification theory II (HQT-II), a general multivariate statistical method for categorical datasets relevant to discriminant analysis. We identify a...

Towards an understanding of cosmopolitanism in deep time: a case study of ammonoids from the middle Permian to the Middle Triassic

Xu Dai & Haijun Song
Cosmopolitanism occurred recurrently during the geological past, especially after mass extinctions, but the underlying mechanisms remain poorly known. Three theoretical models, not mutually exclusive, can lead to cosmopolitanism: (1) selective extinction in endemic taxa, (2) endemic taxa becoming cosmopolitan after the extinction and (3) an increase in the number of newly originated cosmopolitan taxa after extinction. We analyzed an updated occurrence dataset including 831 middle Permian to Middle Triassic ammonoid genera and used two network...

Phylogenetic and ecomorphologic diversifications of spiriferinid brachiopods after the end-Permian extinction

Zhen Guo, Zhong-Qiang Chen & David Harper
The Order Spiriferinida spanning the latest Ordovician to Early Jurassic is a small group of brachiopods overshadowed by other taxa-rich clades during the Paleozoic. It diversified significantly after the end-Permian extinction and became one of the four major clades of Triassic brachiopods. However, the phylogeny and recovery dynamics of this clade during the Triassic still remain unknown. Here, we present a higher-level parsimony-based phylogenetic analysis of Mesozoic spiriferinids to reveal their evolutionary relationships. Ecologically related...

Major compositions and mode of Kohistan lower crustal cumulates

Jingbo Zhang
Arc magmas, a major contributor to continental crust growth, are thought to be more oxidized than mid-ocean ridge basalts, but how arc magmas become oxidized is debated. In particular, fractionation of Fe-rich phases may change the Fe valence and thus the oxidation state of the derivative melt. Here we evaluate the redox effect of Fe-rich amphibole fractionation during arc magma differentiation. We present high precision Fe valence data determined by Mössbauer spectroscopy, and whole-rock Fe3+/∑Fe...

Water level response in wells to dynamic shaking in confining unconsolidated sediments: a laboratory study

Hongbiao Gu, Shuang-Shuang Lan, Huang Zhang, Mingyuan Wang, Baoming Chi & Martin Sauter
This article focuses on laboratory experiments designed to investigate the influence of dynamic shaking on water level fluctuation in wells of unconsolidated sediments. A large flume filled with natural sandy sediments was subjected to horizontal dynamic loading at different frequencies (0.5-15Hz) and accelerations (0.1g, 0.15g, 0.25g and 0.5g), generated by a shaking table. Thus, the change in characteristics of the water and saturated sediments were investigated, including how water level and hydraulic properties changed over...

Temperature database for calculating the magnitudes and rates of temperature change during the Phanerozoic

Haijun Song
The temperature database is used for calculating the magnitudes and rates of climate change in 47 time intervals from early Ordovician (478 Ma) to early Miocene (16 Ma). This database is composed of the most significant warming/cooling events over the past 480 million years and consists of original proxy data, calculated temperature data, locations, geologic age, time span, and relevant references. Paleotemperatures of surface seawater were calculated from multiple proxies such as oxygen isotope from...

Size variations in foraminifers from the Early Permian to the Late Triassic: implications for the Guadalupian-Lopingian and the Permian-Triassic mass extinctions

Yan Feng, Haijun Song & David Bond
The final 10 Myr of the Paleozoic saw two of the biggest biologic crises in Earth history: the Middle Permian extinction (often termed the Guadalupian-Lopingian extinction, GLE) that was followed 7–8 Myr later by Earth’s most catastrophic loss of diversity, the Permian-Triassic mass extinction (PTME). These crises are not only manifest as sharp decreases in biodiversity and - particularly for the PTME - total ecosystem collapse, but they also drove major changes in biological morphological...

Data from: An intermediate type of medusa from the early Cambrian Kuanchuanpu Formation, South China

Xing Wang, Jean Vannier, Xiaoguang Yang, Shin Kubota, Qiang Ou, Xiaoyong Yao, Kentaro Uesugi, Osamu Sasaki, Tsuyoshi Komiya & Jian Han
The tetraradial or pentaradial fossil embryos and related hatched individuals from the early Cambrian Kuanchuanpu Formation are of great interest for understanding the early evolution of medusozoans. The phylogenetic and evolutionary significance of their external and internal characters (e.g. manubrium, tentacles, septa and claustra) is still controversial. Here we describe a new pentamerous medusozoan, Hanagyroia orientalis gen. et sp. nov., characterized by five well-developed perradial oral lips around a remarkably large manubrium, a conspicuous equatorial...

Data from: Flat latitudinal diversity gradient caused by the Permo-Triassic mass extinction

Haijun Song, Shan Huang, Enhao Jia, Xu Dai, Paul Wignall & Alexander Dunhill
The latitudinal diversity gradient (LDG) is recognized as one of the most pervasive, global patterns of present-day biodiversity. However, the controlling mechanisms have proved difficult to identify because many potential drivers covary in space. The geological record presents a unique opportunity for understanding the mechanisms which drive the LDG by providing a direct window to deep time biogeographic dynamics. Here we used a comprehensive database containing 52,318 occurrences of marine fossils to show that the...

Data from: Carbon fixation by photosynthetic mats along a temperature gradient in a Tengchong hot spring

Yidi Zhang
Geothermal hot springs, widely distributed on Earth, are important geological green-house gas sources which contribute large amounts of CO2 emission to the atmosphere. Exploring microbial carbon fixation in these springs is vital to fully understand the carbon budget in these terrestrial aquatic systems. In this study, carbon fixation rate by photosynthetic mats was determined with a 13C labeling approach along a gradient of temperature (~69 - ~75 oC) in a geothermal pool at Rehai Park...

Registration Year

  • 2020
    18

Resource Types

  • Dataset
    18

Affiliations

  • China University of Geosciences
    18
  • University of Bristol
    3
  • Tohoku University
    2
  • Dalian University
    1
  • Institute of Disaster Prevention
    1
  • Northwest University
    1
  • Nanjing Institute of Geology and Paleontology
    1
  • University of Lyon System
    1
  • Durham University
    1
  • Japan Synchrotron Radiation Research Institute
    1