| | Journal (article/letter/editorial) |
massive sulfide sections commonly exhibit unreplaced volcanic relicts, indicating that the alteration succeeded...mostly bleached and hydrothermally metamorphosed volcanic rocks (lava flows and pillow lavas) and mafic-ultramafic...(1992). The mineralization is hosted by subaqueous volcanic rocks, sheared gabbro and peridotite, jasperoid...stratabound sulfide deposits overlying mineralized volcanic rocks, and of syngenetically deposited sulfides...being the depositional prod ucts of submarine volcanic-exhalative pro cesses, syngenetically formed |
| | Report (issue) |
Formation and Puget Group_______________ Unnamed volcanic rocks_________________________ Upper Tertiary...Formation____________________________________ 10. Volcanic conglomerate in the Tukwila Formation________...grained rocks. In the northern part of the area, volcanic sandstone, siltstone, nnd conglomerate as much...beds are composed largely of reworked D. VINE volcanic material and commonly contain as much as 50 percent...interbedded units of volcanic sandstone and siltstone, tuff, lapilli tuff, tuff-breccia, and volcanic conglomerate |
| | Report (volume) |
structural arch.._.____-__--_____-_-__-_____. Northern volcanic field_______-___-_____-___-____--___.______-__...extrusive rocks form the eastern part of the northern volcanic field of the Bearpaw Mountains and occur as lava...the quadrangle, the eastern end of the northern volcanic field of the Bearpaw Mountains is faulted down...part of the quadrangle. Here their total area of outcrop is slightly less than 1 square mile, and they have...area to the north. Their total mapped area of outcrop is about 30 square miles. KOOTENAI FORMATION The |
| | Book |
. . . . . . . . . . . . . . . . . . . 137 6.9 Volcanic Rocks . . . . . . . . . . . . . . . . . . . ....emperors Nero and Vespasian. He was Procurator of Spain under Nero. He had a keen interest in natural phenomena...560–636) A prolific writer who lived in Visigothic Spain, Isidore of Seville was long associated with the...geologic workings of springs, artesian wells, and volcanic eruptions (Fig. 1.2). In the science of mineralogy...spread over the Mediterranean basin especially to Spain and Italy. This technique is based on firing of |
| | Report (issue) |
_______ --------------------Clastic sedimentary and volcanic rocks of the Winchester Mountains ____ -----------Stratigraphy...--------------------------------------Typical outcrop of Scanlan conglomerate ______________________...________________________________ -___ Typical outcrop of Barnes conglomerate __________________________________...with a population of about 200, much the largest community within the quadrangle boundaries. About 2 miles...important unconformity, include locally occurring volcanic tuff, breccia, and conglomerate probably of Triassic |
| | Report (issue) |
basement as an ophiolite 29 The sedimentary and volcanic cover 37 Mole Formation 37 Maetambe Volcanics...sediments 46 Komboro Peak from Laena Island 50 Volcanic breccia of the Ki:imboro Volcanics 5 1 Gorge cut...central Choiseul massive amphibolites and schists outcrop together in a north-west striking zone some 2.5...chiefly from uplifted basement blocks, but andesitic volcanic material is present both as clasts and interbedded...underly the local base of the sedimentary sequence. Volcanic activity began no later than the middle Miocene |
| | Report (edition) |
Lower Devonian sedimentation " • "eooTaphical 10 Outcrop distribution of Devonian rocks in the Midland Valley...areas 31 Palaeolatitudes in the Permian 100 32 Volcanic rocks of Carboniferous and Permian age in the...(D1881) 9.2 Lower Carboniferous lava scarp and volcanic vents at the western end of the Campsie Fells...of rough pasture and rnoorland. Thick piles of volcanic rock of Devonian and Carboniferous age, relatively...coast around Montrose, lies ben-veen ilie line of volcanic hills and the Highlands. The feature ,,videns |
| | Journal (issue) |
world in rocks that were originally formed by volcanic activity (igneous rocks) and in rocks that were...(schists) of rocks that originally formed through volcanic activity (igneous rocks). These rocks were then...silicates group. It was originally formed following volcanic eruption, when molten rocks cooled and solidified...rocks that were first melted then thrown out by volcanic eruptions. When they cooled off they resolidified...rockforming minerals that were created as a result of volcanic activity beneath the surface of the Earth.· Photographs: |
| | Journal (volume) |
crystals from Ambas Aguas in Spain. .&. Cubic crystals from Navajun in Spain. The chemical name for pyrite...magma or laval, for example in the aftermath of volcanic activity. Igneous rocks such as granite and pegmatite...which is found in the native state in areas of volcanic activity. It is used in fungicides, gunpowder......,en en :::::, 0 E CD u, geodes of huge volcanic rocks such as basalt. They are very widespread...habits • Striated cubic crystals of pyrite Spain>. ►• Octahedral cassiterite crystals . ►► |