..., thermal-metamorphic aureole (Bell and others, 1974) which is similar to the contact aureoles of several of the other plutons in the same group. This paper is a result of a study of the magmatic and postconsolidation evolution of these granites. Examination of the contact metamorphism offers a better...

...D. T. Vaniman; J. J. Papike; T. Labotka Abstract Archaean iron formation (>3.1 b.y.), contact-concordant at the base of the Stillwater Igneous Complex, Montana, was contact-metamorphosed to temperatures >800°C at a pressure ≥2 kbar. Temperature estimates are based on the presence of low-Ca...

...D. T. A. Symons; H. I. Hutcheson; M. Stupavsky Abstract Detailed magnetic measurements were made on specimens from profiles across the contact zones of two unmetamorphosed Miocene diabase dikes. The dikes cut Cretaceous plutonic rocks of the Coast Crystalline Complex near Bella Bella, British...

...L. D. Minnigh; P.W.C. van Calsteren; E. den Tex Abstract Several of the metamorphic tectonite Iherzolites of the French Pyrenees have been emplaced as hot solid bodies at high crustal levels in carbonate sediments. On both sides of the contacts the rocks are brecciated, and the occurrence...

...D. Atchuta Rao; H. V. Ram Babu; P. V. Sanker Narayan Abstract A study of the magnetic anomalies produced by sloping geologic contacts, thin dikes, and horizontal cylinders has revealed that a single relationship exists among the magnetic anomalies created by them. The magnetic anomaly due...

... concentrations are lowest in an elongate zone close to the contact. In the same zone, SiO 2 and Na 2 O contents are at a maximum.A marked foliation in the nepheline syenite is caused by a crystallographic orientation of perthite. In the center and the southeast end of the body the foliation dips 70 degrees SW...

...H. P. Eugster; I. M. Chou Abstract Cornwall-type magnetite deposits, as exemplified by the deposit at Cornwall, Pennsylvania, are found at the contact between diabase and carbonate rocks. Contact temperatures are estimated at 600 degrees to 670 degrees C. Ore emplacement occurred after the diabase...

...J. M. Rice Abstract The trioctahedral calcium brittle mica, clintonite, occurs locally in aluminous marbles near the intrusive contact of the Boulder batholith. Assemblages include clintonite-calcite-olivine-clinopyroxene-phlogopite and clintonite-calcite-olivine-spinel-phlogopite. Microprobe...

...Jo Anne Nelson Abstract The western margin of the Coast Plutonic Complex, one of the major tectonic boundaries of the Canadian Cordillera, has been variously interpreted as an intrusive contact, a shear zone, and a suture zone joining the Early Mesozoic Insular Belt to the North American continent...

...W. A. Morris Abstract A positive contact test between Gowganda argillites and Nipissing diabase indicates the shallowly inclined and southerly directed Nipissing remanence records a primary intrusive event. Contact tests on the steeply inclined Nipissing direction are also positive. Together...

...D. V. Fitterman Abstract The self-potential anomalies due to streaming potential effects in the vicinity of a vertical contact are analyzed. This approach is different from most previous studies in that the source is tied to a specific physical mechanism instead of arbitrarily selected charge...

... with and parallel to steep gradients in both the gravity and aeromagnetic fields; and (5) probably is the surface expression of the western contact, at depth, of the intrusive rocks and gneisses of the Coast Range batholithic complex with the schists to the southwest. Le mégalinéament du Coast Range est une...

.... It is concluded that the ores are intrusive-magmatic. The exhalative-sedimentary hypothesis is rejected. The following observations support the magmatic hypothesis of formation:The nature of the host rocks--exclusively acid to intermediate volcanics of alkali-rich character; the contact relations between ore...

...KARL E. SEIFERT Abstract Outcrop scale mapping indicates that the contact zone between Marcy anorthosite and Tupper-Saranac mangerite on Baker Mountain in northeastern New York consists of mangerite dikes cutting both anorthosite and a granofelsic jotunite. All three units are intruded by younger...

... into the stock from distances about 5 km away from the stock side contact. Irreversible mass transfer between these circulating fluids and the Mayflower stock altered the stock to mineral assemblages which reflect the chemical composition of the rocks through which the fluids circulated, the pressure...