USGS Science⌕ Search

Geology topics

Patrick James Barosh

Publications and source records attributed to Patrick James Barosh.

18 recordsLinked to original sources

Geologic reconnaissance of the Uzunpinar iron mine and vicinity, Kayseri Province, Turkey

The Uzunpinar iron mine consists of two pits. The lower, larger pit is situated at the edge of a valley and the smaller upper pit is 1.1 km to the southwest on a limestone ridge. The upper pit is near the northern end of a northeast-trending mineralized fault zone that consists of altered limestone, silicified rock, hematite, and some magnetite. The lower pit exposes a west-trending magnetite-hematite lens that is directly on line with the fault zone and probably is controlled by an extension of the fault zone.

Kayseri Province↗

Geology of Area A, Catak iron deposit, Egrigoz Mountains Kutahya Province, Turkey

The Catak iron deposit consist of magnetite-bearing lenses distributed along the northeast-trending contact of the north end of. the Egrigoz granitic massif in Kutahya Province. Area A is near the northeast end of the deposit and contains three main irregular magnetite lenses. A body of talc-silicate hornfels, almost surrounded by quartzite and schist , lies a short distance from the contact with quartz monzonite and contains the magnetite-bearing lenses west-northwest to northwest-trending structural grain is expressed by schistosity, joints, shears, lithologic contacts and outcrop patterns, although the mineralized rock and general intrusive contact trend northeast. The ranges of the average content of Fe, Si, and S, determined from drill data are 33.54-53.95 percent; 5.86-12.25 percent; and. 8.33-9.49 percent, respectively.

Open-File Report↗

Geology of the Otlukilise iron mine, Sivas Province, Turkey

The Otlukilise iron mine consists of two large bodies (260 by 200 m and 240 by 140 m in diameter) and one small body of iron-bearing sedimentary rocks surrounded by massive recrystallized limestone. The iron-bearing strata are composed from the base upward of conglomerate, sandstone, silt-stone, and claystone containing clastic hematite and magnetite. The lime-stone adjacent to these sedimentary rocks contains fracture fillings and replacement deposits of hematite and limonite that apparently formed from iron leached from the sedimentary rocks. The sedimentary rocks form doubly plunging synclines bordered by ring fault complexes. The border faults have an inward dip, which flattens with depth, and appear to die out downward. The iron-bearing strata appear to be sinkhole fillings in which compaction and possible later lowering of the base of the sinkhole steepened the initial inward dips and caused the border faults. Both sedimentary and replacement deposits form ore, although most of the iron-bearing rock at the mine is below ore grade. The principal ore zone lies just below the contact between iron-bearing strata and limestone. Three-quarters of a million tons of ore have been shipped.

Sivas Province↗

Geology of the Konakpinar--Sarica area, Sivas Province, Turkey

The junction of several major structures and stratigraphic sequences is in the Konakpinar-Sarica area of central Turkey. Most of the area is underlain by Upper Jurassic to Cretaceous limeston and siltstone, early Tertiary sedimentary rock, and remnants of younger volcanic rocks and lacustrine deposits. The northeastern part of the area, however, is formed of serpentinite, of possible Cretaceous age, unconformably overlain by Upper Cretaceous conglomerate and siltstone that crop out extensively east of the area. The regional structure changes direction in the area. Folds and faults change across a northerly striking hinge line from northeast trends on the west to northwest trends on the east. A north-trending regional fault zone is a little east of the hinge line. The northern part of this fault zone and a northwest-striking fault, a possible thrust, east of it form the boundary between the two stratigraphic provinces. The area northeast of this boundary is cut by a series of vertical northwest-trending faults that are downdropped on the southwest. A large northeast-trending fault that is part of a broad fault zone that extends from the Mediterranean Sea northeastward to Divrigi is in the northwest corner of the area. Some thrust faults cut the Cretaceous rocks in the western part of the area; the Upper Jurassic limestone may be allochthonous. The only economic deposit known in the area is at the Otlukilise Iron Mine where iron is present in a sedimentary filling of sinkholesand as secondary replacement deposits in limestone at their borders. Minor deposits of chrome, copper, and coal also occur in the area.

Open-File Report↗

Lower Permian stratigraphy of east-central Nevada and adjacent Utah

The Permian section near Ely, Nevada, consists of, in ascending order: Riepe Spring Limestone, a bluff-forming limestone with abundant corals, and Reipetown Sandstone, a buff to red very coarse-grained siltstone with minor carbonates, both formations of Steele (1960); Arcturus Formation, divisible into a Lower Member composed of alternating medium-bedded limestone and buff siltstone, and an Upper Member composed of alternating thin-bedded limestone and buff to red siltstone and gypsum; and Kaibab Limestone, a massive bioclastic limestone. The Wolfcamp-Leonard boundary occurs within the Arcturus Formation. West of Ely the Riepe Spring Limestone and Reipetown Sandstone thin and change into thin-bedded cherty limestone. These beds, plus the basal part of the Arcturus Formation, form the Carbon Ridge Formation at Dry Mountain at Eureka. At Dry Mountain, minor clastic chert occurs in the Arcturus Formation, and beyond to the west clastic chert replaces most of the limestone to form the conglomeratic Garden Valley Formation. The cherty limestone at the base of the Garden Valley is apparently equivalent to the upper part of the Carbon Ridge Formation at Carbon Ridge. Eastward in Utah the Riepe Spring Limestone is recognizable in the Confusion Range, but is almost unrecognizable in the Needle Range. The dolomite content in the Reipetown Sandstone usually increases to 25 percent of the formation in the Confusion and Needle ranges. The Arcturus Formation thins and undergoes moderate lithologic changes. It is equivalent to the rocks above a horizon 300 feet below Bed A of the Arcturus Formation as mapped in the Confusion Range by Hose and Repenning (1959, 1963).

Nevada, Utah↗