Preprints

Filtering by Subject: Tectonics and Structure

Understanding Sampling Bias in the Global Heat Flow Compilation

Tobias Stål, Anya M. Reading, Sven Fuchs, et al.

Published: 2022-06-17
Subjects: Databases and Information Systems, Earth Sciences, Geology, Tectonics and Structure

Geothermal heat flow is commonly inferred from the gradient of temperature values in boreholes. Such measurements are expensive and logistically challenging in remote locations and, therefore, often targeted to regions of economic interest. As a result, measurements are not distributed evenly. Some tectonic, geologic and even topographic settings are overrepresented in global heat flow [...]

How to drain a megalake: Comments on a study by Palcu et al. (2021) Scientific Reports 11, Art. Nr.: 11471.

Michal Šujan, Natália Hudáčková, Imre Magyar

Published: 2022-05-27
Subjects: Earth Sciences, Geology, Oceanography, Paleobiology, Paleontology, Sedimentology, Stratigraphy, Tectonics and Structure

In a recent paper by Palcu et al. (2021: Scientific Reports 11, Art. Nr.: 11471), the Cape Panagia section on the Taman peninsula (Russian Black Sea) was dated using magnetostratigraphy, in order to calibrate the timing of previously published regressions of the Paratethys megalake. The authors of the paper claim that this “largest megalake in the geological record” experienced four major [...]

Salt-detached strike-slip faulting, Outer Kwanza Basin, Offshore Angola

Aurio Erdi, Christopher Aiden-Lee Jackson

Published: 2022-05-25
Subjects: Geology, Geophysics and Seismology, Stratigraphy, Tectonics and Structure

We here use a 3D seismic reflection dataset from Outer Kwanza Basin, offshore Angola to examine the structure and growth of salt-detached strike-slip faults. The faults occur in four, up to 13.8 km-long, NE-trending arrays that are physically linked by restraining bend and releasing stepovers, and which presently overlie Aptian salt and base-salt relief related to pre-salt faulting. We suggest [...]

Geometry and growth of syn-tectonic plutons emplaced in thrust shear zones: Insights from Abu Ziran Pluton, Egypt

Abdullah T. Mohammad, Yahia El Kazzaz

Published: 2022-05-20
Subjects: Earth Sciences, Physical Sciences and Mathematics, Tectonics and Structure

Coupling of deformation and magmatism has been reported in several old orogenic belts, particularly along thrust faults and shear zones. The syn-kinematic plutons in exhumed shear zones offer the best opportunity to understand the complex relationship between magmatism and regional deformation. The present paper investigates the geometry and internal structure of granite plutons emplaced in [...]

Time-Dependent Decrease in Fault Strength in the 2011--2016 North Kanto Earthquake Sequence

Sam Wimpenny, Natalie Forrest, Alex Copley

Published: 2022-05-19
Subjects: Earth Sciences, Tectonics and Structure

Two near-identical Mw 5.8 earthquakes in 2011 and 2016 ruptured the Mochiyama Fault in North Kanto, Japan. The unusually short repeat time between the Mochiyama earthquakes provides a rare opportunity estimate the evolution of stress on a fault through an earthquake cycle, as the stress drop in the first earthquake provides a reference from which we can infer variations through time in the [...]

A very unconventional hydrocarbon play: the Mesoproterozoic Velkerri Formation of Northern Australia

Grant Cox, Alan S. Collins, Amber J.M. Jarrett, et al.

Published: 2022-05-16
Subjects: Geochemistry, Geology, Sedimentology, Stratigraphy, Tectonics and Structure

The ca. 1.5–1.3 Ga Roper Group of the greater McArthur Basin is a component of one of the most extensive Precambrian hydrocarbon-bearing basins preserved in the geological record, recently assessed as containing 429 million barrels of oil and eight trillion cubic feet of gas (in place). It was deposited in an intra-cratonic sea, referred to here as the McArthur-Yanliao Gulf. The Velkerri [...]

Complex fault system revealed from 3-D seismic reflection data with deep learning and fault network analysis

Thilo Wrona, Indranil Pan, Rebecca E. Bell, et al.

Published: 2022-05-13
Subjects: Artificial Intelligence and Robotics, Geology, Geophysics and Seismology, Tectonics and Structure

Understanding where normal faults are is critical to an accurate assessment of seismic hazard, the successful exploration for and production of natural (including low-carbon) resources, and for the safe subsurface storage of CO2. Our current knowledge of normal fault systems is largely derived from seismic reflection data imaging intra-continental rifts and continental margins. However, [...]

The CREp 36Cl exposure age calculator: development version “dev”

Irene Schimmelpfennig, Pierre-Henri BLARD, Jim Tesson, et al.

Published: 2022-05-04
Subjects: Geochemistry, Geology, Geomorphology, Glaciology, Sedimentology, Tectonics and Structure, Volcanology

Chlorine-36 (36Cl) is currently the only in situ cosmogenic nuclide applicable in carbonates, Ca- and K-rich feldspars and aphyric silicate rocks. Because the production reactions of 36Cl are more numerous and complex than those of other cosmogenic nuclides (e.g. 10Be, 3He), comprehensive and user-friendly calculators are essential for routine application of 36Cl to Earth surface research [...]

The signature of lithospheric anisotropy at post-subduction continental margins: new insight from XKS splitting analysis in northern Borneo

Conor Andrew Bacon, Nicholas Rawlinson, Simone Pilia, et al.

Published: 2022-05-02
Subjects: Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics, Tectonics and Structure

The relative paucity of recent post-subduction environments globally has meant that, so far, little is known about tectonic processes that occur during and after subduction termination, as previously convergent tectonic plates adjust to the new stress regime. The region of Southeast Asia that now encompasses northern Borneo has been host to two sequential episodes of subduction—both now [...]

Magnetic fabrics reveal three-dimensional flow processes within elongate magma fingers near the Shonkin Sag laccolith (MT, USA)

Jonas Köpping, Alexander R. Cruden, Craig Magee, et al.

Published: 2022-04-29
Subjects: Earth Sciences, Geology, Physical Sciences and Mathematics, Tectonics and Structure, Volcanology

Unravelling magma flow in ancient sheet intrusions is critical to understanding how magma pathways develop and feed volcanic eruptions. Analyzing the shape preferred orientation of minerals in intrusive rocks can provide information on magma flow, because crystals may align parallel to the primary flow direction. Anisotropy of magnetic susceptibility (AMS) is an established method to quantify [...]

New maps of global geologic provinces and tectonic plates

Derrick Hasterok, Jacqueline A Halpin, Alan S. Collins, et al.

Published: 2022-04-21
Subjects: Earth Sciences, Tectonics and Structure

Accurate spatial models of tectonic plates and geological terranes are important for analyzing and interpreting a wide variety of geoscientific data and developing compositional and physical models of the lithosphere. We present a global compilation of active plate boundaries and geological provinces in a shapefile format with interpretive attributes (e.g., crust type, plate type, province type, [...]

Strain localisation and microstructure evolution in polycrystalline ice by in-situ strain field measurements

Marco Antonio Lopez-Sanchez, Thomas Chauve, Maurine Montagnat, et al.

Published: 2022-03-28
Subjects: Earth Sciences, Glaciology, Tectonics and Structure

We explore the links between the evolutions of the strain field and microstructure in coarse-grained Ih ice. Using digital image correlation (DIC), we monitored the evolution of the strain field in two columnar ice samples deformed by creep (uniaxial compression at constant load) at -7 ºC and 0.5 MPa up to 9.5% bulk shortening. After a brief transient (<0.2% bulk strain), in which strain [...]

CCC - integrated multiscale study of salt cavern abandonment in the Netherlands

Tobias S. Baumann, Pierre Bérest, Benoit Brouard, et al.

Published: 2022-03-24
Subjects: Geology, Geophysics and Seismology, Materials Science and Engineering, Mineral Physics, Mining Engineering, Other Earth Sciences, Tectonics and Structure

The KEM-17 project of the Dutch State Supervision of Mines presented a critical review of concepts of cavern abandonment and related science. It recommended that analyses of cavern abandonment are done as an integrated project, addressing (i) micro-scale physical processes, (ii) cavern scale models based on field scale experiments and numerical models, (iii) the salt dome scale, to model the far [...]

Late Tonian development and provenance of the Adelaide Superbasin

Jarred Cain Lloyd, Alan S. Collins, Morgan L. Blades, et al.

Published: 2022-03-22
Subjects: Earth Sciences, Geochemistry, Geology, Sedimentology, Stratigraphy, Tectonics and Structure

The late Tonian sequences of the Adelaide Superbasin were witness to the birth of the proto-Pacific Ocean during the breakup of Rodinia. Understanding the sedimentology and provenance of these rocks from across the basin is key to understanding both their deposition over ~70 million years, the local palaeogeography, and leads to a better understanding of the early development of the proto-Pacific [...]

Internal Planetary Feedbacks, Mantle Dynamics, and Plate Tectonics

Adrian Lenardic, Johnny Seales

Published: 2022-03-18
Subjects: Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics, Planetary Geophysics and Seismology, Planetary Sciences, Tectonics and Structure

Isolating planetary feedbacks, and feedback analysis, are prevalent aspects of climate and Earth surface process science. An under appreciation of internal planet feedbacks, and feedback analysis for plate tectonics research, motivate this chapter. We review feedbacks that influence the Earth's thermal evolution and expand them to include magmatic history and planetary water budgets. The [...]

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