scholarly journals Complexity within the Venetia K01 NE coherent kimberlite facies association: implications for conduit processes in kimberlite pipe forming eruptions

2019 ◽  
Keyword(s):  
Kimberlite Pipe ◽  
Facies Association ◽  
Conduit Processes

RUTILE-DIAMOND INTERGROWTHS FROM UDACHNAYA KIMBERLITE PIPE (YAKUTIA)

2017 ◽  
Vol 39 (3) ◽  
pp. 17-31
Author(s):  
V. Kvasnytsya ◽  
◽  
O. Vyshnevskyi ◽  
Keyword(s):  
Kimberlite Pipe

Primary hydrocarbon inclusions in garnet of diamondiferous eclogite from the Udachanaya kimberlite pipe, Yakutia

2009 ◽  
Vol 426 (1) ◽  
pp. 695-698 ◽  
Author(s):  
A. A. Tomilenko ◽  
S. V. Kovyazin ◽  
L. N. Pokhilenko ◽  
N. V. Sobolev
Keyword(s):  
Kimberlite Pipe

Nb-rutile from eclogite microxenolith of the Zagadochnaya kimberlite pipe

2011 ◽  
Vol 439 (1) ◽  
pp. 970-973 ◽  
Author(s):  
N. V. Sobolev ◽  
A. M. Logvinova ◽  
Yu. G. Lavrent’ev ◽  
N. S. Karmanov ◽  
L. V. Usova ◽  
...  
Keyword(s):  
Kimberlite Pipe

Significance in the Integration of Facies Analysis, Stable Isotopes and Diagenetical Results for the High-Resolution Sequence Stratigraphy Characterization in the Shallow Platform of Shuaiba Formation, Lower Cretaceous, Abu Dhabi Onshore, UAE

2021 ◽  
Author(s):  
Kevin Michael Torres ◽  
Noura Al Madani ◽  
Rodrigo Rafael Gutierrez
Keyword(s):  
High Resolution ◽  
Direct Evidence ◽  
Facies Analysis ◽  
Carbonate Platform ◽  
Nutrient Supply ◽  
Abu Dhabi ◽  
Small Scale ◽  
Facies Association ◽  
Accommodation Space ◽  
Shallow Platform

Abstract The study presents the sequence stratigraphy of the carbonate platform focused in lower part of Shuaiba Formation, as well as the organization of the arrangement formed by the cyclical sedimentological evolution at high-resolution scale, through the facies analysis, diagenetical imprints and finally, significance of stable carbonate isotope results in the building up of carbonate platform in southeast Abu Dhabi. Interpreted stratigraphic surfaces from integration of depositional facies reviewed in all available cored data within studied area and stable carbon isotope results allowed that four small-scale regression-transgression depositional cycles can be discriminated which are stacked into a medium-scale sequence, that may record a 600 kyr Milankovitch signal. The small-scale sequences were correlated within the studied area using both conventional well logs and stable isotope records. Transgression hemicycles represent the increasing of accommodation space and can be identified in direct evidence, such as 25-40 ft. thickness of lithocodium/bacinella floatstones and skeletal peloidal packstones facies, association of facies interpreted within upper slope sub-environment. Likewise, in δ13C profiles, the rise/fall turnarounds of small-scale sequences are marked by negative δ13C peaks and associated with characteristics patterns: (1) proportion decrease of shallower sub-environments facies is interpreted as an rising relative sea-level and (2) decreasing δ13C trends interpreted to be related to decreasing nutrient supply. The medium/big pores of floatstones poorly connected in packstone matrix are expressed in the medium/high porosity with low permeabilities. In contrast, regressive hemicycles represent the reduction in accommodation space and can be characterized in direct evidence, such as the growing up of persistent 10-20 ft. thickness with thousands of meters of correlation of stromatoporoids and rudist facies, association of facies interpreted within shelf-margin complex sub-environment. In addition, the fall/rise turnarounds are marked by positive δ13C peaks, associated with the stromatoporoids/rudists mounds with characteristic patterns: (1) proportion increase of shallower sub-environments facies is interpreted as falling relative sea-level and increase in proximity and (2) increasing δ13C values interpreted to reflect increasing nutrient supply. Unusually very high permeability is attributed to the present of fractures and dissolution events that is enhanced where proportion of stromatoporoids facies are more pronounced. The described characterization resulted in the identification of genetic cycles that reproduce the sedimentological evolution, which are presented in small-scale sequences. In addition, the δ13C values enabled to understand the internal organization and the development of the carbonate building up in the Shuaiba shallow platform evolution. This study provides update and understanding on sedimentary facies, depositional pattern, and expands on previous published works, using new approach from semi-regional to local scales. Finally, results help to understand the laterally extensive water break-through thin intervals, which are directly related to the regressive hemicycles described previously.

Age and Composition of Zircons From the Devonian Petrivske Kimberlite Pipe of the Azov Domain, the Ukrainian Shield

2021 ◽  
Vol 43 (4) ◽  
pp. 50-55
Author(s):  
L.V. SHUMLYANSKYY ◽  
V. KAMENETSKY ◽  
B.V. BORODYNYA
Keyword(s):  
Trace Elements ◽  
Trace Element ◽  
Continental Crust ◽  
Kimberlite Pipe ◽  
Zircon Crystal ◽  
Precambrian Rock ◽  
Weighted Mean ◽  
Terrigenous Rocks ◽  
Devonian Age ◽  
Isotope Systematics

Results of a study of U-Pb and Hf isotope systematics and trace element concentrations in five zircon crystals separated from the Devonian Petrivske kimberlite are reported in the paper. Four zircons have yielded Paleoproterozoic and Archean ages, while one zircon grain gave a Devonian age of 383.6±4.4 Ma (weighted mean 206Pb/238U age). The Precambrian zircons have been derived from terrigenous rocks of the Mykolaivka Suite that is cut by kimberlite, or directly from the Precambrian rock complexes that constitute continental crust in the East Azov. The Devonian zircon crystal has the U-Pb age that corresponds to the age of kimberlite emplacement. It is 14 m.y. younger than zircon megacrysts found in the Novolaspa kimberlite pipe in the same area. In addition, Petrivske zircon is richer in trace elements than its counterparts from the Novolaspa pipe. Petrivske and Novolaspa zircons crystallized from two different proto-kimberlite melts, whereas the process of kimberlite formation was very complex and possibly included several episodes of formation of proto-kimberlite melts, separated by extended (over 10 M.y.) periods of time.

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