Results 41 to 50 of about 734 (136)

Pelagic barite precipitation at micromolar ambient sulfate

Nature Communications, 2017
The question of how significant barite deposits were able to form from early Earth’s low-sulfate seas remains controversial. Here, the authors show pelagic barite precipitation within a strongly barite-undersaturated ecosystem, highlighting the ...
Tristan J. Horner, Helena V. Pryer, Sune G. Nielsen, Peter W. Crockford, Julia M. Gauglitz, Boswell A. Wing, Richard D. Ricketts   +6 more
doaj   +1 more source

ENRICHMENT OF MASSIVE SULFIDES FROM THE SEMENOV HYDROTHERMAL CLUSTER (MID-ATLANTIC RIDGE) IN BARITE: A RESULT OF E-MORB INVOLVEMENT AND MAGMATIC CONTRIBUTION [PDF]

Минералогия
The paper reviews and compares the barite findings in hydrothermal fields of the midoceanic ridges. The genetic significance of barite is considered for the Semenov hydrothermal sulfide cluster associated with an oceanic core complex (OCC) at 13°30′ N of
I.Yu. Melekestseva, G.A. Tret’yakov, V.E. Beltenev   +2 more
doaj   +1 more source

Coupled intra‐ and inter‐tunnel short‐range order in hollandites: a case study of mannardite Ba[(Ti4+)6(V3+)2]O16

Acta Crystallographica Section B, Volume 82, Issue 4, Page 439-446, August 2026.
Single‐crystal X‐ray diffuse scattering combined with Monte Carlo simulations and 3D‐ΔPDF analysis reveals complex short‐range order in mannardite, involving coupled Ba–Ba interactions within and between tunnels and framework relaxation.Mannardite, Ba[(Ti4+)6(V3+)2]O16, a mineral of the hollandite supergroup, is characterized by a tunnel structure ...
Ella Mara Schmidt, Marta Morana, Cristian Biagioni, Arianna Minelli, Alexei Bosak, Giovanni Orazio Lepore   +5 more
wiley   +1 more source

Barite from the Upper Idrijca River valley (W Slovenia)

Geologija, 2002
The Carnian – Julian beds exposed at the Tratnik landslide location in the Upper Idrijca River valley are of various lithology. Mudstones, shales and fine-grained sandtones prevail, containing lenses of micritic limestone and quartz conglomerate.
Jože Čar, Meta Dobnikar, Dragomir Skaberne   +2 more
doaj  

Evaluation of Barium Sulfate (Barite) Solubility Using Different Chelating Agents at a High Temperature [PDF]

Journal of Petroleum Science and Technology, 2017
Barium sulfate (barite) is one of the widely used weighting materials in the preparation of drilling fluid for deep oil and gas wells. Barite is not soluble in the regular solvents; such as, hydrochloric acid (HCl) and other acids.
BADR BA GERI, Mohamed Mahmoud, Reyad Shawabkeh, Abdulazeez Abdulraheem   +3 more
doaj   +1 more source

Potassium isotopic compositions and exposure ages of evolved and silica‐rich achondrites

Meteoritics &Planetary Science, Volume 61, Issue 8, Page 2140-2162, August 2026.
Abstract Some of the oldest igneous rocks in the Solar System include evolved and silica‐rich achondrites that originate from parent bodies less than 1000 km in diameter, referred to as planetesimals. While Earth was initially in a molten state and required continental crust formation and plate tectonics to generate andesite bulk compositions, evolved ...
Z. Vaci, Z. Tian, P. Koefoed, M. Habermann, M. Humayun, K. Ziegler, H. Busemann, D. Krietsch, J. M. D. Day, K. Wang   +9 more
wiley   +1 more source

Sedimentology of silica granules and haematite in the 3.47 Ga Antarctic Creek Member, Mount Ada Basalt, Western Australia

Sedimentology, Volume 73, Issue 5, Page 1842-1866, August 2026.
ABSTRACT The Paleoarchean Antarctic Creek Member of the Mount Ada Basalt, Eastern Pilbara Terrane, Western Australia, includes beds of jasper and white chert composed of sand‐sized silica granules that often contain or are mixed with silt‐sized particles of haematite.
Donald R. Lowe, Gary R. Byerly
wiley   +1 more source

Geological Characteristics, Distribution Patterns and Genesis Analysis of Hydrothermal Barite Deposits in Kaili Area, Guizhou Province

Kuangchan zonghe liyong
[Objective] The Kaili Area in Guizhou Province, as one of the main distribution areas of hydrothermal barite deposits in Guizhou, has significant economic value and scientific research significance for its hydrothermal barite deposits. However, there are
Xigui ZHANG, Sheng DAI, Shanli HE, Qingpeng SHI   +3 more
doaj   +1 more source

Synergistic Physicochemical Inhibition of Reactive Shale Formations Using Hydrothermally Synthesized Hydroxyapatite Nickel Tungstate Nanocomposites in Water‐Based Drilling Fluids

Asia-Pacific Journal of Chemical Engineering, Volume 21, Issue 4, July/August 2026.
ABSTRACT Wellbore instability driven by the volumetric expansion of reactive shale formations remains a primary operational challenge in modern drilling engineering, causing severe mechanical failures and substantial economic deficits. The objective of this study is to formulate and evaluate a novel dual‐action chemical additive capable of ...
Ghaleb Oriquat, Basim Abdul Alrhym, A. C. Umamaheshwer Rao, Shivam P. Chaudhary, Pardeep Singh Bains, Ripendeep Singh, Murotov Nurshod, Rasulbek Eshmetov, Ahmad Abumalek   +8 more
wiley   +1 more source

Barium and its Importance as an Indicator of (Paleo)Productivity

Anais da Academia Brasileira de Ciências
Barium (Ba) is a trace element which occurs predominantly as barite mineral (BaSO4) in the marine environment. Previous work suggests that barite concentrations are related to the organic carbon flux and marine biological debris in the water column ...
BIANCA T.P. LIGUORI, MARCELO G. DE ALMEIDA, CARLOS E. DE REZENDE   +2 more
doaj   +1 more source