scholarly journals Middle Triassic autoclastic deposits from southwestern Bosnia and Herzegovina

2016 ◽  
Vol 31 (2) ◽  
pp. 1-12
Author(s):  
Duje Smirčić ◽  
Boško Lugović ◽  
Dunja Aljinović ◽  
Hazim Hrvatović ◽  
Tea Kolar-Jurkovšek ◽  
...  
Keyword(s):  
Bosnia And Herzegovina ◽  
Deep Sea ◽  
Middle Triassic ◽  
Sea Water ◽  
Rock Types ◽  
Extensional Tectonic ◽  
Volcaniclastic Rocks ◽  
Water Saturated ◽  
External Dinarides

Middle Triassic volcanic and volcaniclastic rocks have been recognized at several localities near Bosansko Grahovo, in southwestern part of Bosnia and Herzegovina in the External Dinarides. Peculiar types of autoclastic rocks were investigated. These are peperites and hyaloclastites. Regarding specific structures, mineral composition and micropetrographic characteristics it was possible to further differentiate hyaloclastites into in situ hyaloclastites and slightly resedimented hyaloclastites that represent genetic succession. All rock types occurred in a deep sea troughs that formed as a consequence of Middle Triassic extensional tectonic and rift related wrench faulting. In situ hyaloclastites and slightly resedimented hyaloclastites were formed due to quenching at the contact of lava effusions with sea water. Genesis of peperites is related to lava emplacement in unconsolidated water saturated lime mudstones that were deposited in deep sea basin. All investigated rock types represent first findings of autoclastic deposits in the External Dinarides. Biostratigraphic constraints achieved by means of conodont species Neogondolella excentrica, Paragondolella excelsa, Paragondolella trammeri and Gladigondolella tethydis indicate Late Anisian to Early Ladinian interval of the autoclastic deposits from Bosansko Grahovo.

In‐situ enrichment of heavy metals from deep‐sea water by an ion‐exchange pump system

1996 ◽  
Vol 14 (4) ◽  
pp. 297-314 ◽  
Author(s):  
Andrea Koschinsky ◽  
Axel Szemeitat ◽  
Michael Maggiulli ◽  
Peter Halbach
Keyword(s):  
Heavy Metals ◽  
Ion Exchange ◽  
Deep Sea ◽  
Sea Water ◽  
Pump System ◽  
Deep Sea Water

scholarly journals Novel use of burrow casting as a research tool in deep-sea ecology

2012 ◽  
Vol 8 (4) ◽  
pp. 648-651 ◽  
Author(s):  
Koji Seike ◽  
Robert G. Jenkins ◽  
Hiromi Watanabe ◽  
Hidetaka Nomaki ◽  
Kei Sato
Keyword(s):  
Deep Sea ◽  
Sea Water ◽  
Benthic Metabolism ◽  
Burrow Structure ◽  
Shallow Water Species ◽  
Water Species ◽  
Burrow Morphology ◽  
Water Depths ◽  
Seep Site

Although the deep sea is the largest ecosystem on Earth, its infaunal ecology remains poorly understood because of the logistical challenges. Here we report the morphology of relatively large burrows obtained by in situ burrow casting at a hydrocarbon-seep site and a non-seep site at water depths of 1173 and 1455 m, respectively. Deep and complex burrows are abundant at both sites, indicating that the burrows introduce oxygen-rich sea water into the deep reducing substrate, thereby influencing benthic metabolism and nutrient fluxes, and providing an oxic microhabitat for small organisms. Burrow castings reveal that the solemyid bivalve Acharax johnsoni mines sulphide from the sediment, as documented for related shallow-water species. To our knowledge, this is the first study to examine in situ burrow morphology in the deep sea by means of burrow casting, providing detailed information on burrow structure which will aid the interpretation of seabed processes in the deep sea.

Stratigraphic Definition and Correlation of Middle Triassic Volcaniclastic Facies in the External Dinarides: Croatia and Bosnia and Herzegovina

2018 ◽  
Vol 29 (4) ◽  
pp. 864-878 ◽  
Author(s):  
Duje Smirčić ◽  
Tea Kolar-Jurkovšek ◽  
Dunja Aljinović ◽  
Uroš Barudžija ◽  
Bogdan Jurkovšek ◽  
...  
Keyword(s):  
Bosnia And Herzegovina ◽  
Middle Triassic ◽  
External Dinarides

Development of a deep-sea mercury sensor using in situ anodic stripping voltammetry

2015 ◽  
Vol 49 (6) ◽  
pp. 613-620 ◽  
Author(s):  
Masahiro Yamamoto ◽  
Hitoshi Kodamatani ◽  
Yuriko Kono ◽  
Akinori Takeuchi ◽  
Ken Takai ◽  
...  
Keyword(s):  
Deep Sea ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Anodic Stripping ◽  
Mercury Sensor

scholarly journals Development of an Easy-to-Operate Underwater Raman System for Deep-Sea Cold Seep and Hydrothermal Vent In Situ Detection

Sensors ◽  
2021 ◽  
Vol 21 (15) ◽  
pp. 5090
Author(s):  
Qingsheng Liu ◽  
Jinjia Guo ◽  
Wangquan Ye ◽  
Kai Cheng ◽  
Fujun Qi ◽  
...  
Keyword(s):  
Deep Sea ◽  
Hydrothermal Vent ◽  
Methane Hydrate ◽  
Sulfur Cycle ◽  
Cold Seep ◽  
Remotely Operated Vehicle ◽  
Bacterial Mats ◽  
Optical Module ◽  
In Situ Detection

As a powerful in situ detection technique, Raman spectroscopy is becoming a popular underwater investigation method, especially in deep-sea research. In this paper, an easy-to-operate underwater Raman system with a compact design and competitive sensitivity is introduced. All the components, including the optical module and the electronic module, were packaged in an L362 × Φ172 mm titanium capsule with a weight of 20 kg in the air (about 12 kg in water). By optimising the laser coupling mode and focusing lens parameters, a competitive sensitivity was achieved with the detection limit of SO42− being 0.7 mmol/L. The first sea trial was carried out with the aid of a 3000 m grade remotely operated vehicle (ROV) “FCV3000” in October 2018. Over 20,000 spectra were captured from the targets interested, including methane hydrate, clamshell in the area of cold seep, and bacterial mats around a hydrothermal vent, with a maximum depth of 1038 m. A Raman peak at 2592 cm−1 was found in the methane hydrate spectra, which revealed the presence of hydrogen sulfide in the seeping gas. In addition, we also found sulfur in the bacterial mats, confirming the involvement of micro-organisms in the sulfur cycle in the hydrothermal field. It is expected that the system can be developed as a universal deep-sea survey and detection equipment in the near future.

Suitability of Natural Geomedia for Radwaste Storage

1982 ◽  
Vol 15 ◽  
Author(s):  
W. S. Fyfe
Keyword(s):  
Rock Properties ◽  
Fracture Flow ◽  
Time Prediction ◽  
Sedimentary Sequences ◽  
Rock Types ◽  
Direct Observations ◽  
Long Time ◽  
Mining Disturbance ◽  
Selection Of

ABSTRACTSelection of the best rock types for radwaste disposal will depend on their having minimal permeability, maximal flow dispersion, minimal chance of forming new wide aperture fractures, maximal ion retention, and minimal thermal and mining disturbance. While no rock is perfect, thinly bedded complex sedimentary sequences may have good properties, either as repository rocks, or as cover to a repository.Long time prediction of such favorable properties of a rock at a given site may be best modelled from studies of in situ rock properties. Fracture flow, dispersion history, and geological stability can be derived from direct observations of rocks themselves, and can provide the parameters needed for convincing demonstration of repository security for appropriate times.

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