Chao Ma

Chao Ma
Chengdu University of Technology | CDUT · Institute of Sedimentary Geology

PhD

About

54
Publications
16,831
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
858
Citations
Citations since 2017
37 Research Items
724 Citations
2017201820192020202120222023050100150200
2017201820192020202120222023050100150200
2017201820192020202120222023050100150200
2017201820192020202120222023050100150200
Additional affiliations
July 2007 - May 2010
China University of Geosciences (Beijing)
Position
  • Research Assistant

Publications

Publications (54)
Article
Full-text available
The development of integrated astronomical and radioisotopic time scales from rhythmic strata of the Western Interior Basin (WIB) has played a fundamental role in the refinement of Late Cretaceous chronostratigraphy. In this study, X-ray fluorescence (XRF) core scanning is utilized to develop a new elemental data set for cyclostratigraphic investig...
Article
New field mapping reveals a large Cenozoic thrust system in the Tanggula Range and Tuotuohe region, central Tibet. The thrust system is parallel to the Tanggula Range, and it is termed the Tanggula thrust system (TTS). Three thrust belts can be identified in this thrust system. From south to north, they are the Geraddong-Esuima thrust belt (GEB), t...
Article
Full-text available
The tectonic event during Cretaceous and its relationship with hydrocarbon accumulation in the Qiangtang Basin is discussed based on zircon U-Pb dating and the study of deformation, thermochronology and hydrocarbon formation. LA-ICPMS zircon U-Pb dating indicates that the tectonic event took place during the Early-Late Cretaceous (125–75Ma). The ev...
Article
The Gyangze basin, located in southern Tibet, is one of the representative areas for Cretaceous Oceanic Red Beds (CORBs). We investigated and inter-correlated several new CORB outcrops in the western and southeastern part of the Gyangze area in addition to the previously described Chuangde section. The CORBs in the Gyangze basin mainly consist of s...
Article
Full-text available
The Tanggula (唐古拉) thrust system and the Tuotuohe (沱沱河) foreland basin, which represent major Cenozoic tectonic units of the central Tibetan plateau, have been recently studied. Field investigation, analyses of deformation and construction of two restored balanced structural sections suggest 75–100 km (51%–64%) of N-S shortening in the Tanggula thr...
Article
Full-text available
Earth’s climate during the last 4.6 billion years has changed repeatedly between cold (icehouse) and warm (greenhouse) conditions. The hottest conditions (supergreenhouse) are widely assumed to have lacked an active cryosphere. Here we show that during the archetypal supergreenhouse Cretaceous Earth, an active cryosphere with permafrost existed in...
Article
According to modern atmospheric circulation models, the Intertropical Convergence Zone (ITCZ), as the Earth's meteorological equator, plays an essential role in the low-latitude hydrologic cycles. The limited availability of high-resolution tropical climate archives, especially from the Early Paleozoic Era, severely limits our understanding of ITCZ...
Article
The Albian Age is characterized by frequent short-lived perturbations of the global carbon cycle, including a series of Oceanic Anoxic Events (OAEs). Carbon Isotope Excursions (CIEs) document these OAEs in detail. A strong influence of orbital forcing on oceanographic and climatic conditions in the Albian has been documented, but the relationship b...
Article
Full-text available
Geologic time is an important dimension in geological research. Geologic time data are commonly collected from multiple sources in data-intensive studies of Earth’s history and raise an issue of data cleansing and integration. A knowledge graph of the international geological time scale has been established to harmonize heterogeneous data to facili...
Article
Full-text available
Data‐driven discovery in geoscience requires an enormous amount of FAIR (findable, accessible, interoperable and reusable) data derived from a multitude of sources. Many geology resources include data based on the geologic time scale, a system of dating that relates layers of rock (strata) to times in Earth history. The terminology of this geologic...
Article
Full-text available
Zircon is a widely-used heavy mineral in geochronological and geochemical research because it can extract important information to understand the history and genesis of rocks. Zircon has various types, and an accurate examination of zircon type is a prerequisite procedure before further analysis. Cathodoluminescence (CL) imaging is one of the most...
Article
The lithofacies identification is critical for forecasting sweet spots of hydrocarbon explorations. Well logs are widely used in lithofacies identifications because they are petrophysical measurements of subsurface stratigraphy which reflect lithological successions and depositional processes. The traditional lithofacies identification from well lo...
Article
Full-text available
Across the Miocene–Pliocene boundary (MPB; 5.3 million years ago, Ma), late Miocene cooling gave way to the early-to-middle Pliocene Warm Period. This transition, across which atmospheric CO 2 concentrations increased to levels similar to present, holds potential for deciphering regional climate responses in Asia—currently home to more than half of...
Article
https://www.researchgate.net/publication/356109713_Centennial_to_millennial_variability_of_greenhouse_climate_across_the_mid-Cenomanian_event-Supplemental_Materials
Article
Full-text available
Centennial- to millennial-scale climate variations are often attributed to solar forcing or internal climate system variability, but recognition of such variations in the deep-time paleoclimate record is extremely rare. We present an exceptionally well-preserved, millimeter-scale laminated marlstone from a succession of precession-driven limestone-...
Article
Full-text available
It has been demonstrated that the sedimentary deposits of Eocene succession in Bohai Bay Basin in China responded to astronomically forced climate changes. Several sections have been evaluated for cyclostratigraphy and many astronomical time scales (ATSs) have been constructed in Paleogene Bohai Bay Basin. However, the calibrations of age model and...
Article
Astronomical forcing associated with Earth's orbital and inclination exerts a major control on climate as recorded in the sedimentary rocks. Alkaline lake deposits in the second member (F2) of the Fengcheng Formation provided a unique geological record to explore the paleoclimatic conditions during the Late Paleozoic Ice Age (LPIA) in northern Pang...
Article
Full-text available
Earth's climate system is complex and inherently nonlinear, which can induce some extraneous cycles in paleo-climatic proxies at orbital time scales. The paleoenvironmental consequences of these extraneous cycles are debated owing to their complex origin. Here, we compile high-resolution datasets of total organic carbon (TOC) and stable carbon isot...
Article
The Spatiotemporal Weighted Regression (STWR) model is an extension of the Geographically Weighted Regression (GWR) model for exploring the heterogeneity of spatiotemporal processes. A key feature of STWR is that it utilizes the data points observed at previous time stages to make better fit and prediction at the latest time stage. Because the temp...
Article
Full-text available
Current barriers hindering data-driven discoveries in deep-time Earth (DE) include: substantial volumes of DE data are not digitized; many DE databases do not adhere to FAIR principles (findable, accessible, interoperable, and reusable); we lack a systematic knowledge graph for DE; existing DE databases are geographically heterogeneous; a significa...
Article
Full-text available
Local spatiotemporal nonstationarity occurs in various natural and socioeconomic processes. Many studies have attempted to introduce time as a new dimension into a geographically weighted regression (GWR) model, but the actual results are sometimes not satisfying or even worse than the original GWR model. The core issue here is a mechanism for weig...
Article
Full-text available
Ontologies and vocabularies are an effective way to promote data interoperability in open data and open science. The deep time knowledge graph is one of the most discussed and studied topics in geoscience ontologies and vocabularies. The continuous evolution of deep time concepts calls for a mechanism of version control and organization to reduce t...
Article
1: Methods for inferring geographic origin from the stable isotope composition of animal tissues are widely used in movement ecology, but few computational tools and standards for data interpretation are available. 2: We introduce the assignR R package, which provides a structured, flexible toolkit for isotope‐based migration data analysis and inte...
Research
https://cran.r-project.org/web/packages/assignR/
Article
Sedimentary couplets that are generated by astronomical forcing are common in pelagic and hemipelagic depositional settings. This study disentangles the time scales (sedimentation rates) of the two lithofacies that contribute to such astronomically-forced couplets, by introducing the Alpha method. This new method can be applied to precession or obl...
Preprint
Full-text available
Abstract. Local spatiotemporal non-stationarity occurs in various natural and socioeconomic processes. Many studies have attempted to introduce time as a new dimension into the geographically weighted regression model (GWR), but the actual results are sometimes not satisfied or even worse than the original GWR model. The core issue here is a mechan...
Article
Deep lithospheric processes associated with the formation of major orogens, including the removal of lower crust and underlying mantle through delamination associated with orogen building are poorly constrained. With a view to evaluate the potential link between deep geodynamic processes and magmatic events, we performed in situ zircon Hf-O-Li isot...
Article
Full-text available
One of the clocks that record the Earth history is (quasi-) periodic astronomical cycles. These cycles influence the climate that can be ultimately stored in sedimentary rocks. By cracking these (quasi-) periodic sedimentation signals, high resolution astronomical time scale (ATS) can be obtained. Paleoclimate proxies are widely used to extract ast...
Article
Full-text available
One of the clocks that record the Earth history is (quasi-) periodic astronomical cycles. These cycles influence the climate that can be ultimately stored in sedimentary rocks. By cracking these (quasi-) periodic sedimentation signals, high resolution astronomical time scale (ATS) can be obtained. Paleoclimate proxies are widely used to extract ast...
Article
Cretaceous terrestrial sedimentary records are crucial for our understanding of geological systems’ responses to past climate change under greenhouse condition. Numerous publications have documented that Milankovitch cycles were a dominant climate driver over multi-millennial timescales. However, most of these orbital signals were derived from mari...
Article
Full-text available
Cyclostratigraphy is an important tool for understanding astronomical climate forcing and reading geological time in sedimentary sequences, provided that an imprint of insolation variations caused by Earth’s orbital eccentricity, obliquity and/or precession is preserved (Milankovitch forcing). Numerous stratigraphic and paleoclimate studies have ap...
Article
Full-text available
Global-scale cycling of silicon through the biosphere, atmosphere, and hydrosphere has received much attention although, silicon cycling in the Earth's lithosphere remains poorly understood. As the products of internal heat and material exchange, igneous rocks preserve significant information of silicon migration through the lithosphere. Here we re...
Article
Astronomically-forced insolation cycles (“Milankovitch cycles”) serve as a primary control on climate, and when preserved in the stratigraphic record, they provide a high-resolution in situ chronometer. These celestial rhythms derive from the fundamental frequencies of the Solar System, and Earth's precession constant. The fundamental frequencies o...
Article
This study documents the occurrence of atmospheric dust from Pennsylvanian carbonates of the Copacabana Formation, recovered in core (Mobil-Oxy Manuripi X-1) from the Madre de Dios basin (Bolivia), within southern mid-latitudes (~35°S) of western Gondwana. The Copacabana Formation spans Pennsylvanian-Early Permian time, and thus formed coeval with...
Article
Widespread Cenozoic sediments in and around the Tibetan Plateau (TP) are thought to have played an important role in explaining the process of the India-Asia collision as well as its interactions with global and regional paleoclimate. However, high-resolution temporal frameworks of sedimentary sequences and controls on geological and climatic event...
Article
Variations in the Earth’s orbit and spin vector are a primary control on insolation and climate; their recognition in the geological record has revolutionized our understanding of palaeoclimate dynamics1, and has catalysed improvements in the accuracy and precision of the geological timescale2. Yet the secular evolution of the planetary orbits beyo...
Poster
Full-text available
The Boquillas Formation (Fm.) (equivalent to the Eagle Ford Group) was deposited at the Southern end of the Cretaceous Western Interior Seaway (KWIS) and the northwestern margin of the Gulf of Mexico Carbonate Shelf (passive margin) in a starved retroarc foreland basin setting during part of the Cenomanian and Turonian Stages (CT; 97-90 Ma). The Bo...
Poster
Full-text available
The Cenomanian to Turonian (C-T) Boundary transition (95-93 Ma) represents one of the most profound global perturbations in the carbon cycle of the last 140 Ma during a Greenhouse climate interval, named oceanic anoxic event #2 (OAE2). OAE2 is defined by a globally recognised positive carbon isotope excursion (CIE), indicating the widespread remova...
Article
Chromatic methods have been widely used in paleoclimate research for unconsolidated or semiconsolidated sediments. However, few researches on diagenetic rocks using these methods have been reported, for their primary compositions and colors may be altered in the process of diagenesis and postdiagenesis. Thus, the deep-time research by chromatometry...
Article
The Cyclostratigraphic study has become a principal tool for refinement of the geologic time scale. Compared to the Western Tethys, the Cyclostratigraphic study on the Eastern Tethys is relatively insufficient. The precision of the study for the pre-Quaternary still needs to be advanced in Eastern Tethys. Cretaceous marine sediments are cropped out...

Network

Cited By

Projects

Project (1)
Project
The objective of this project is to investigate and quantify reproducibility of cyclostratigraphic studies and to provide a platform to discuss the merits and pitfalls of different methodologies, and their applicability.