A5112271937- Geological and Geochemical Analysis
- earthquake and tectonic studies
- Geological and Tectonic Studies in Latin America
- High-pressure geophysics and materials
- Mineralogy and Gemology Studies
- Geological and Geophysical Studies Worldwide
- Geochemistry and Geologic Mapping
- Geological Formations and Processes Exploration
- Geological formations and processes
- Geology and Paleoclimatology Research
- Paleontology and Stratigraphy of Fossils
- Geological Modeling and Analysis
- 3D Modeling in Geospatial Applications
- Geological Studies and Exploration
- Landslides and related hazards
- Health and Medical Studies
- Cultural Heritage Materials Analysis
- CO2 Sequestration and Geologic Interactions
- Reservoir Engineering and Simulation Methods
- Cryospheric studies and observations
- Geochemistry and Elemental Analysis
- Geochemistry and Geochronology of Asian Mineral Deposits
TU Bergakademie Freiberg
2014-2025
Magmatic rocks and depositional setting of associated volcaniclastic strata along a north‐south traverse spanning the southern Tien Shan eastern Pamirs Kyrgyzstan Tajikistan constrain tectonics Tibet. The northern northwestern Tibet contain north facing Kunlun suture, south Jinsha intervening Carboniferous to Triassic Karakul–Mazar subduction accretion system; latter is correlated with Songpan‐Garze–Hoh Xi system arc composite early Paleozoic late Paleozoic‐Triassic arc. Arc formation in...
Eight points of recurring controversy regarding the primary foundations models Gulf Mexico and Caribbean tectonic evolution are identified examined. The eight controversial mainly because disconnect between different scales thinking by workers, a common but unfortunate problem in geological profession. Large-scale thinkers often unaware local detail, local-scale workers fail to appreciate level evolutionary precision constraint provided regional tectonics plate kinematics. controversies are:...
Abstract We integrate known and suspected Meso-American plate motions with the geochronology of Caribbean arcs Central American HP/LT belts to promote two primary concepts. The first is that Greater Antillean Arc formed at about 135 Ma by inception SW-dipping subduction along a sinistral 'inter-American transform' connecting west-facing zones North South Cordillera. arc magmas date from complexes 118 Ma, they were as lithosphere was engulfed between America during westward drift – divergence...
Abstract New structural, geochronological, and petrological data highlight which crustal sections of the North American–Caribbean Plate boundary in Guatemala Honduras accommodated large-scale sinistral offset. We develop chronological kinematic framework for these interactions test Palaeozoic to Recent geological correlations among Maya Block, Chortís terranes southern Mexico northern Caribbean. Our principal findings relate how partitioned deformation; whereas Block record Late...
Cenozoic gneiss domes comprise one third of the surface exposure Pamir and provide a window into deep crustal processes India‐Asia collision. The largest these are doubly vergent, composite Shakhdara‐Alichur southwestern Pamir, Tajikistan, Afghanistan; they separated by low‐strain horst. Top‐to‐SSE, noncoaxial pervasive flow over up to 4 km thick South shear zone exhumed crust from 30–40 depth in ~250 × 80 Shakhdara dome; top‐to‐NNE Alichur exposed upper rocks ~125 25 dome. Gunt bounds dome...
Tectonics modify the base-level of rivers and result in progressive erosion landscapes. We propose here a new method to classify landscapes according their erosional stages. This is based on combination two DEM-based geomorphic indices: hypsometric integral, which highlights elevated surfaces, surface roughness, increases with topographic elevation incision by drainage network. The these indices allows one produce map discontinuities that can be easily compared known structural framework. In...
Research Article| March 01, 2017 Proterozoic–Mesozoic history of the Central Asian orogenic belt in Tajik and southwestern Kyrgyz Tian Shan: U-Pb, 40Ar/39Ar, fission-track geochronology geochemistry granitoids Alexandra Käßner; Käßner † 1Geologie, Technische Universität Bergakademie Freiberg, 09599 Germany †alexandra.kaessner@geo.tu-freiberg.de Search for other works by this author on: GSW Google Scholar Lothar Ratschbacher; Ratschbacher Jörg A. Pfänder; Pfänder Bradley R. Hacker; Hacker...
We present the first Lu–Hf dating on HP/UHP mineral assemblages in eclogitic rocks from Puerto Cabello, northern central Venezuela. The characterise Carayaca terrane of Cordillera de la Costa (CdlC) along coast and faults bounding valley Caracas City. new late Eocene peak metamorphic ages (38–36 Ma) pertain to subduction Proto-Caribbean crust 80–100 km depth beneath Caribbean forearc as latter collided with break formerly assumed correlation Margarita Island eclogites Villa Cura blueschists...
Earthquake swarms occur mostly in regions with CO2-enriched pore fluids. It is generally accepted that both geodynamic stress accumulation and critical fluid pressures act as a triggering mechanism for most seismic events. The new thesis presented here hydrothermal alteration processes fault zones help facilitate the shear failure propagation due to mechanical weakening dissolution of wall rock, addition normal overpressure. basic idea corrosion cracking results from chemical comminution has...
Abstract Within the last decade, modern petrological and geochronological methods in combination with detailed studies of field geology have allowed reconstruction tectonic processes northwestern part Caribbean Plate. The development an oceanic Proto-Yucatán Basin can be traced from Late Jurassic to Mid-Cretaceous. From Mid-Cretaceous onward, interaction this basin Arc observed. Geochronological data prove continuous magmatic activity generation HP mineral suites Aptian...
The Sancti Spiritus Dome of the eastern Escambray (Cuba) represents a metamorphic fold and thrust structure which was part Cretaceous subduction-accretion complex Greater Antillean Arc. On basis structural data pressure-temperature-time evolution can be subdivided into four units interpretable as nappes: high-grade greenschist-facies unit (Pitajones unit), high-pressure tectonic melange (Gavilanes amphibolites (Yayabo unit) – tectonically overlying - low-pressure metagabbros Arc (Mabujina...
Abstract The metamorphic rock sequences exposed on the Island of Margarita, Venezuela, located in southeastern corner Caribbean Plate margin, are composed a high-pressure/low-temperature (HP/LT) nucleus subducted to at least 50 km depth, now structurally overlain by lower-grade greenschist-facies units lacking any sign high-pressure subduction-zone metamorphism. HP/LT involves protoliths both oceanic (metabasalts and intimately associated carbonaceous schists La Rinconada unit; peridotite...
The Altenberg-Teplice Volcanic Complex (ATVC) exposed on both sides of the German-Czech border in Erzgebirge/ Krušné hory Mts. is one earliest late-Variscan to post-Variscan volcanic centres Europe.The ATVC features an early volcanosedimentary succession preserved Schönfeld-Altenberg Depression (SADC), covered by voluminous ignimbrites and lavas Teplice Rhyolite (TR).Published radiometric age dating rocks associated mineralizations suggest a Lower Namurian (Serpukhovian) for SADC.The SADC...
Abstract Samples and documentation of outcrops drillings, facies analysis, whole rock geochemistry radiometric ages have been employed to re-evaluate the Late Carboniferous Tharandt Forest caldera (TFC) co-genetic Niederbobritzsch granite (NBG) in eastern Erzgebirge near Dresden, Germany. The c. 52 km 2 TFC harbours strongly welded ignimbrites with a preserved minimum thickness 550 m. Composition initial fallout tephra at base fill, comprising lithics rhyolitic basic lava, silica-rich...
Agates in Paleocene/Eocene tuffs from El Picado/Los Indios, Cuba were investigated to characterize the mineral composition of agates and provide data for reconstruction agate forming processes. The volcanic host rocks are strongly altered fractured contain numerous fissures veins mineralized by quartz chalcedony. These features indicate secondary alteration silicification processes during tectonic activities that may have also resulted formation massive agates. Local accumulation manganese...
We present new and critical isotopic data for late‐ to postkinematic granitoid intrusions their epidote‐amphibolite‐facies country rocks (Mabujina unit) in central Cuba. The Mabujina unit tectonically overlies a nappe sequence of high‐pressure (HP) metamorphic the Escambray Massif. These have variable granodioritic granitic composition, are generally rich large ion lithophile elements, resemble normal midocean ridge basalts high field strength element concentrations. On basis low initial...