New insights on chimney growth model and native gold enrichment in modern seafloor hydrothermal chimneys

Siyu Hu, Steve Barnes, Anais Pagès

Petroleum Exploration Society of Australia (PESA)

... and away from the conduit) which are bounded by a thin layer dominated by fine-grained sphalerite. Clustered pyrite grows outwards from the sphalerite...

Genesis of Primary Structures in Anhydrite

Charles M. Riley, John V. Byrne

Journal of Sedimentary Research (SEPM)

... as a replacement of other minerals and are not discussed in this paper. A variety of distinctive structures, which may occur individually or in combination...

Guide to Coastal Outcrops of the Monterey Formation of Western Santa Barbara County, California

John B. Dunham

Pacific Section SEPM

... to directly observe the origin of black-glassy chert, which forms as a result of replacement of a pure-silica opal-CT precursor rock. At Pt. Pedernales...

Collaboration Solves Long Standing Corrosion Problem

M. Brameld, S. Thomas, G. S. Malab

Australian Petroleum Production & Exploration Association (APPEA) Journal

... that this pitting cannot be effectively managed by inspection and, as a result, the current policy is that piping replacement should be planned once...

Rules of Sandstone Diagenesis Related to Reservoir Quality

Earle F. McBride

GCAGS Transactions

...) is influenced by the abundance of ductile and other easily deformable grains, whereas chemical processes of cementation, replacement, and dissolution...

Influence of Porosity and Facies of Baturaja Carbonate to the Seismic Wave Velocity: Case Study of Tambun Field West Java

Jarot Setyowiyoto, Bagus Endar B. Nurhandoko, Ariffin Samsuri, Bambang Widjanarko, Thurisina

Indonesian Petroleum Association

... Formation is determined as “P” layer and has contact with Parigi Formation carbonates in the top. Transition zone between Cibulakan Formation...

Base Exchange in Relation to Sediments: Part 6. Special Features of Sediments

W. P. Kelley

AAPG Special Volumes

... to Effect of Sea Water," Bull. Amer. Assoc. Petrol. Geol., Vol. 18, pp. 358-67. 1934. 11. MARSHALL, C. E., "Layer Lattices and Base-Exchange Clays...

Effect of Fractures on Reserve Calculations as Determined by Petrology: Birthright Field, Hopkins County, Texas

Hugh J. Mitchell-Tapping

GCAGS Transactions

... (Fig. 7, 8). The small ooids at the base are usually cracked, spalled or microfractured. Larger fractures can also run through a layer of ooids (Fig. 3a...

Soft soils: A study on their electrical resistivity values and geotechnical properties (porosity, SPT and particle size distribution)

Najmiah Rosli, Rosli Saad, Nazrin Rahman, Nur Azwin Ismail

Geological Society of Malaysia (GSM)

... soil extends up to 32 m in thickness where it overlies the sandy layer and could be correlated back to lithology profile from borehole record...

Geopressured Shale and Sealing Effect of Smectite to Illite Transition

Robert L. Freed , Donald R. Peacor

AAPG Bulletin

... microscopy (TEM) techniques. Initially, illite and smectite (with some mixed-layer component?) are present in subparallel domains, with smectite packets...

Characterization of chert in the Dammam Formation (Eocene), Kuwait: Clues to groundwater silicification processes

Fikry Ibrahim Khalaf,, Médard Thiry, Anthony Milnes, Rehab Alnaqi

Journal of Sedimentary Research (SEPM)

...; evidence for opal-CT precursors and direct quartz replacement: American Journal of Science, v. 288, p. 798– 809. Maliva, R.G., and Siever, R., 1988 b...

Chromite Deposits of Papua New Guinea„A Future Potential Source of Chrome

P. M. Afenya

Geological Society of Malaysia (GSM)

... ores. The Ramu ore estimated at about 223 million tonnes is lateriticand forms two layers; the top layer has a grade of 9 % Cr, 1.46% Ni and 0.16 % Co...

Controlled excavations in the Romualdo Formation Lagerstätte (Araripe Basin, Brazil) and pterosaur diversity: Remarks based on new findings

Bruno C. Vila Nova, Antonio A. F. Saraiva, Joao K. R. Moreira, Juliana M. Sayão

PALAIOS

.... In the upper and most fossiliferous layer, the faunal composition shows a pattern of fish distribution never observed before, indicating that previous...

Middle Ordovician to Middle Silurian Carbonate Cycle, Brodeur Peninsula, Northwestern Baffin Island

H. P. Trettin

CSPG Bulletin

... lamination of this type of dolomite, which is in some instances only one crystal layer thick, leave little doubt that it formed by replacement at the sea...

Use of Seismic Surveying in Exploration for Oil-Bearing Structures Related to Upper Devonian Reefs

O. M. Mkrtchyan, F. I. Khat’yanov, F. P. Shalaginova

Petroleum Geology: A Digest of Russian Literature

... as relatively constant along interfaces, changing only in passing from one geologic layer to another. This model was acceptable at one stage in the knowledge...

Sonic Log Analysis from Isotropic and Anisotropic Media In Carbonate Reservoir, the Case Study at Stella Alpina Field

Wahyu Tri Sutrisno, Septian Prahastudhi, Ari Teguh Sugiarto, Ayi Syaeful Bahri, Dwa Desa Warnana, Yulia Putri Wulandari

Indonesian Petroleum Association

... Vertical Transverse Isotropic (VTI) media. We also use a fluid replacement model with Castagna and Krief equations for investigating the Vp/Vs ratio...

Evolutionary Series of Antimony Deposits of Eastern USSR--Summary: Minerals

V. I. Berger

AAPG Special Volumes

... the interior Asiatic continent correlates with the increase in relative thickness of the granite-metamorphic layer of the earth's crust...

Deposition and Diagenesis of Sodium-Calcium Sulfate Salts in the Tertiary Saline Lakes of the Madrid Basin, Spain

Salvador Ordónez, Maria De Los Angeles García Del Cura

Special Publications of SEPM

... glauberite Fig 6D ondary polyhalite layer in Tuz G6lti an ephemeral lake in Turkey They also proposed an origin by gypsum replacement The secondary...

Adjustment of Land Derived Clays to the Marine Environment

Maurice C. Powers

Journal of Sedimentary Research (SEPM)

... chlorite. Mixed-layer clays were observed in the estuaries and are related to and difficult to distinguish from differentially hydrated monomineralic...

Initiation of Upward-Moving Gravity Structures: Unit 15: Principles

Martin P. A. Jackson, William E. Galloway

AAPG Special Volumes

... if a density inversion exists even from a perfectly flat source layer. But for solids to rise, some kind of imperfection is required to trigger growth, even...

Abstract: Diagenesis of Mixed-Layer Clay Minerals in the South Timbalier Area, Gulf of Mexico

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Diagenesis of Upper Jurassic Concretions from the Antarctic Peninsula

Roberto A. Scasso , Wolfgang Kiessling

Journal of Sedimentary Research (SEPM)

... calcite concretions: Journal of Sedimentary Petrology, v. 57, p. 140-152. DREVER, J.I., 1971, Magnesium-iron replacement in clay minerals in anoxic...

Silica Diagenesis, Porosity Evolution, and Mechanical Behavior In Siliceous Mudstones, Mowry Shale (Cretaceous), Rocky Mountains, U.S.A.

Kitty L. Milliken, Terrilyn Olson

Journal of Sedimentary Research (SEPM)

... several forms: extrabasinal detrital silt (some with transported overgrowths), replacement of skeletal debris, minor overgrowth on detrital quartz...

Early Diagenesis: Expansible Soil Clay-sea Water Reactions

Herman E. Roberson

Journal of Sedimentary Research (SEPM)

... of sea water-immersed samples show that discrete illite does not form as had been expected. Instead, a "mixed-layer" phase develops. This phase...

Clay-Mineral Distribution in Permo-Pennsylvanian Shales of Val Verde Basin and Yates-Todd Arch, Texas

Drayton B. Speights , George Brunton

AAPG Bulletin

... zone (Zone I) contains illite, chlorite, kaolinite, mixed-layer clay, and small amounts of montmorillonite. A middle zone (Zone II) contains illite...