III.—The Sudbury Nickel-Ores

1908 ◽  
Vol 5 (1) ◽  
pp. 18-19 ◽  
Author(s):  
A. P. Coleman
Keyword(s):  
Presidential Address ◽  
Granite Gneiss ◽  
Ore Deposits ◽  
Lower Edge ◽  
Magmatic Origin ◽  
Sulphide Ores ◽  
Ore Bodies ◽  
The World ◽  
Nickel Ores ◽  
Adjoining Rock

In Professor Gregory's interesting presidential address contained in your journal for October, there is a reference to the origin of the Sudbury ores, in which he expresses the opinion that they were deposited from solution long after the first consolidation of the rocks with which they are associated. As the Sudbury ore deposits are perhaps the best examples in the world of the magmatic segregation of sulphide ores it seems a pity that the weight of Professor Gregory's authority should be given against the correct view. Probably he has not read the reports on the region by Dr. Barlow and myself in which incontrovertible proof of the magmatic origin of these ores has recently been given. In the report prepared by myself it is shown that all the ore bodies are found at the lower edge of a laccolithic sheet of norite, blending upwards into micropegmatite, or on dike-like projections from this sheet. The laccolithic sheet is 37 miles long, 17 miles wide, and has dozens of ore bodies connected with its basic edge. The adjoining rock may be granite, gneiss, green schists, graywacke, etc., without affecting in any way the monotonous character of the ore. The ore bodies may contain fragments of the adjoining rocks and sometimes also of the norite, for some crushing and faulting has taken place; but everywhere the solid ore passes into pyrrhotitenorite, and then into norite spotted with blebs of ore. The sulphides have sharp boundaries against the adjoining rocks, but blend into the norite.

A ‘Lengthy Digression’: Why Mining Lagged Elsewhere

2019 ◽  
pp. 163-206
Author(s):  
Jeannette Graulau
Keyword(s):  
The North ◽  
Ore Bodies ◽  
Catchment Areas ◽  
Hindu Kush ◽  
The World ◽  
Mining History ◽  
Silver Mining ◽  
History Of ◽  
Mountain Development ◽  
Mining Regions

This chapter provides the mining history of the mountains of the rest of the world. It begins with England in which major silver discoveries took place in Bere Ferrers or Bere Ferris, a valley of the Tamar River in North Devon, southwest of Dartmoor, and at Combe Martin in the north after the mid-thirteenth century. However, English mines were challenging as they were physically distant from the central arteries of international trade of continental Europe and the commercial cities with continental catchment areas. This chapter also talks about silver mining that flourished in the Persian Province of Khorasan, the Samanid region of Transoxiana, and the Hindu Kush. These are the lands of the most spectacular mountain heights, where mountains piled up one behind another and mountain development assumes its grandest forms. It ends with mining history in India in which its mining exploits did not compete with the achievements of European mining regions. Mining in Zawar endured technical difficulties. Geologist Bagghi states that miners worked on hard siliceous quarzitic ore bodies, where drilling today calls for the use of tungsten carbide bits.

scholarly journals HERMIONE, EVOLUTION OF ATe-BEARING EPITHERMAL MINERALIZATION, ARGOLIS, HELLAS

2007 ◽  
Vol 40 (2) ◽  
pp. 996 ◽  
Author(s):  
S. Tombros ◽  
K. St. Seymour
Keyword(s):  
Sedimentary Rocks ◽  
Ore Deposits ◽  
Stage I ◽  
Stage Ii ◽  
Quartz Veins ◽  
Minor Contribution ◽  
Epithermal Mineralization ◽  
Ore Bodies ◽  
Calcite Veins ◽  
Sandstone Formation

The Cu-Te-bearing pyrite deposits of Hermione, Argolis are hosted in Miocenic ophiolites. The ophiolites are overlain by a shale-sandstone formation with intercalations of limestones and manganiferous sedimentary rocks. The ore deposits form irregular lenticular or stratiform ore bodies, and veins. These ore bodies are related to volcanic activity in an arc-related rift at the margins of a palaeocontinent. Late N- to NNE-trending, sinistral, milky quartz-pyrite-calcite veins cut the host ophiolites. Alteration haloes of quartz-calcite, albite-sericitechlorite, and chalcedony-epidote-clay minerals are developed in the lavas as concentric shells, or as envelops that parallel the quartz veins. The telluriumbearing mineralization is developed in two successive stages, characterized by the assemblages: pyrite-(pyrrhotite)-magnetite-chalcopyrite-sphalerite (Stage I) and galena-sphalerite-freibergite-marcasite-chalcocite (Stage II), followed by a supergene stage. The cobaltiferous pyrite-chalcopyrite geothermometer defined two ranges of last-equilibration temperatures: 220° to 250°Cfor Stage I, and 120° to 195°Cfor Stage II. The calculated δ18 Ο and SD compositions of the mineralizing fluids, at 200° and 250°C, reflect the dominance of a magmatic component. The calculated δ SH2S fluid values reveal a magmatic source for the sulphur, with minor contribution from submarine sediments, whereas tellurium is proposed to be derived from a mafic-ultramafic source.

scholarly journals THERMOCHRONOLOGY AND MATHEMATICAL MODELING OF THE FORMATION DYNAMICS OF RARE‐METAL‐GRANITE DEPOSITS OF THE ALTAI COLLISION SYSTEM

2019 ◽  
Vol 10 (2) ◽  
pp. 375-404 ◽  
Author(s):  
N. G. Murzintsev ◽  
I. Yu. Annikova ◽  
A. V. Travin ◽  
A. G. Vladimirov ◽  
B. A. Dyachkov ◽  
...  
Keyword(s):  
Rare Metal ◽  
Ore Deposits ◽  
Event Correlation ◽  
Magmatic Differentiation ◽  
Collision System ◽  
Rare Metal Granite ◽  
Development History ◽  
Ore Bodies ◽  
Thermal Cooling

The article presents an event correlation of the Permian‐Triassic granites of the Altai collision system, which are associated with industrial ore deposits and occurrences (Mo‐W, Sn‐W, Li‐Ta‐Be). The multi‐system and multi‐mineral isotope datings of igneous rocks and ore bodies (U/Pb, Re/Os, Rb/Sr, Ar/Ar‐methods) suggest the postcollisional (intraplate) formation of ore‐magmatic systems (OMS), the duration of which depended on the crustmantle interaction and the rates of tectonic exposure of geoblocks to the upper crustal levels.Two cases of the OMS thermal history are described: (1) Kalguty Mo‐W deposit associated with rare‐metal granite‐leucogranites and ongonite‐ elvan dykes, and (2) Novo‐Akhmirov Li‐Ta deposit represented by topaz‐zinnwaldite granites and the contemporary lamprophyre and ongonit‐elvan dykes. For these geological objects, numerical modeling was carried out. The proposed models show thermal cooling of the deep magmatic chambers of granite composition, resulting in the residual foci of rare‐metal‐granite melts, which are known as the petrological indicators of industrial ore deposits (Mo‐W, Sn‐W, Li‐Ta‐Be). According to the simulation results concerning the framework of a closed magmatic system with a complex multistage development history, the magmatic chamber has a lower underlying observable massif and a reservoir associated with it. A long‐term magmatic differentiation of the parental melt (a source of rare‐metal‐granite melts and ore hydrothermal fluids) takes place in this reservoir.

Presidential Address: Area Studies as a Critical Discipline

1980 ◽  
Vol 40 (1) ◽  
pp. 15-25 ◽  
Author(s):  
Benjamin I. Schwartz
Keyword(s):  
World War Ii ◽  
Presidential Address ◽  
World War ◽  
Area Studies ◽  
The World ◽  
War Effort

As we all know, the modest, colorless, and ambiguous term “area studies” emerged during the course of World War II as a way of describing one minor enterprise in the war effort. It was an enterprise designed to achieve an encapsulated understanding of the unknown areas of the world in which we suddenly found ourselves engaged. During and after the war, most area studies were contemporary in orientation and, given the circumstances of their origin, extremely vulnerable to the charge of serving “nonscholarly” political or military interests.

Introduction

1994 ◽  
Author(s):  
Václav Nēmec
Keyword(s):  
Ad Hoc ◽  
International Association ◽  
The United States ◽  
Ore Deposits ◽  
Western World ◽  
Mathematical Geology ◽  
25Th Anniversary ◽  
European Universities ◽  
The World

Friends and associates of Daniel F. Merriam have prepared this volume in Dan's honor to commemorate his 65th birthday and mark the 25th anniversary of the International Association for Mathematical Geology. This compendium is in the tradition of the Festschriften issued by European universities and scholarly organizations to honor an individual who has bequeathed an exceptional legacy to his students, associates, and his discipline. Certainly Dan has made such an impact on geology, and particularly mathematical geology. It is a great privilege for rne to write the introduction to this Festschrift. The editors are to be congratulated for their idea to collect and to publish so many representative scientific articles written by famous authors of several generations. Dan Merriam is the most famous mathematical geologist, in the world. This statement will probably provoke some criticism against an over-glorification of Dan. Some readers will have their own candidates (including themselves) for such a top position. I would like to bring a testimony that the statement is correct and far from an ad hoc judgment only for this solemn occasion. It may be of interest to describe how I became acquainted with Dan. In my opinion this will show how thin and delicate was the original tissue of invisible ties which helped to build up the first contacts among Western and Eastern colleagues in the completely new discipline of mathematical geology. The role of Dan Merriam in opening and increasing these contacts has been very active indeed. In the Fall 1964 I was on a family visit in the United States. This was— after the coup of Prague in 1948—my first travel to the free Western world. With some experience in computerized evaluation of ore deposits, I was curious to see the application of computers in geology and to meet colleagues who had experience with introducing statistical methods into regular estimation of ore reserves. I had very useful contacts in Colorado and in Arizona. In Tucson I visited the real birthplace of the APCOM symposia.

scholarly journals Mineralogical and Geochemical Constraints on the Origin of Mafic–Ultramafic-Hosted Sulphides: The Pindos Ophiolite Complex

Minerals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 454 ◽  
Author(s):  
Demetrios G. Eliopoulos ◽  
Maria Economou-Eliopoulos ◽  
George Economou ◽  
Vassilis Skounakis
Keyword(s):  
Hydrothermal Alteration ◽  
Hydrothermal Systems ◽  
Ophiolite Complex ◽  
Magmatic Origin ◽  
Magnetite Ore ◽  
Sulphide Ores ◽  
Mineralogical Characteristics ◽  
Tectonic Contact ◽  
Geochemical Constraints ◽  
Complete Transformation

Sulphide ores hosted in deeper parts of ophiolite complexes may be related to either primary magmatic processes or links to hydrothermal alteration and metal remobilization into hydrothermal systems. The Pindos ophiolite complex was selected for the present study because it hosts both Cyprus-type sulphides (Kondro Hill) and Fe–Cu–Co–Zn sulphides associated with magnetite (Perivoli-Tsoumes) within gabbro, close to its tectonic contact with serpentinized harzburgite, and thus offers the opportunity to delineate constraints controlling their origin. Massive Cyprus-type sulphides characterized by relatively high Zn, Se, Au, Mo, Hg, and Sb content are composed of pyrite, chalcopyrite, bornite, and in lesser amounts covellite, siegenite, sphalerite, selenide-clausthalite, telluride-melonite, and occasionally tennantite–tetrahedrite. Massive Fe–Cu–Co–Zn-type sulphides associated with magnetite occur in a matrix of calcite and an unknown (Fe,Mg) silicate, resembling Mg–hisingerite within a deformed/metamorphosed ophiolite zone. The texture and mineralogical characteristics of this sulphide-magnetite ore suggest formation during a multistage evolution of the ophiolite complex. Sulphides (pyrrhotite, chalcopyrite, bornite, and sphalerite) associated with magnetite, at deeper parts of the Pindos (Tsoumes), exhibit relatively high Cu/(Cu + Ni) and Pt/(Pt + Pd), and low Ni/Co ratios, suggesting either no magmatic origin or a complete transformation of a preexisting magmatic assemblages. Differences recorded in the geochemical characteristics, such as higher Zn, Se, Mo, Au, Ag, Hg, and Sb and lower Ni contents in the Pindos compared to the Othrys sulphides, may reflect inheritance of a primary magmatic signature.

Who fears to speak of politics? John Kells Ingram and hypothetical nationalism

1998 ◽  
Vol 31 (122) ◽  
pp. 202-221 ◽  
Author(s):  
G.K. Peatling
Keyword(s):  
Trinity College ◽  
Academic Career ◽  
Presidential Address ◽  
First Line ◽  
Nationalist Movement ◽  
Trinity College Dublin ◽  
The World ◽  
History Of ◽  
History Of Political Economy ◽  
One Act

John Kells Ingram was born in County Donegal in 1823. His ancestry was Scottish Presbyterian, but his grandparents had converted to Anglicanism. He was educated at Trinity College, Dublin, the most prestigious academic institution in nineteenth-century Ireland. In a brilliant academic career spanning over fifty years he proceeded to occupy a succession of chairs at the college. His published work included an important History of political economy (1888), and he delivered a significant presidential address to the economics and statistics section of the British Association for the Advancement of Science (1878). Ingram influenced, and was respected by, many contemporary social and economic thinkers in the British Isles and elsewhere. In an obituary one of Ingram’s friends exaggerated only slightly in describing him as ‘probably the best educated man in the world’. Yet contemporary perspectives on Ingram’s career were warped by one act of his youth which was to create a curious disjunction in his life. In 1843, when only nineteen years old, Ingram was a sympathiser with the nationalist Young Ireland movement. One night, stirred by the lack of regard shown for the Irish rebels of 1798 by the contemporary O’Connellite nationalist movement, he wrote a poem entitled ‘The memory of the dead’, eulogising these ‘patriots’. Apparently without much thought, Ingram submitted the poem anonymously to the Nation newspaper. It appeared in print on 1 April 1843 and, better known by its first line, ‘Who fears to speak of ’Ninety-Eight?’, became a popular Irish nationalist anthem.

scholarly journals Alexander Stuart Watt, 21 June 1892 - 2 March 1985

1990 ◽  
Vol 35 ◽  
pp. 403-423
Keyword(s):  
Plant Community ◽  
Plant Communities ◽  
Presidential Address ◽  
Field Work ◽  
Natural Vegetation ◽  
Pattern And Process ◽  
Ecological Society ◽  
The World

Alexander Stuart Watt was an ecologist who made a major contribution to the study of British vegetation. The ideas on the dynamics of plant communities in his Presidential Address to the British Ecological Society in 1947, 'Pattern and process in the plant community’ revolutionized the understanding of natural vegetation throughout the world. He was a scientist of a kind which is now uncommon; though always ready to advise those who sought his help, he rarely worked in collaboration, but made his major and lasting contribution to the understanding of vegetation entirely by his own work. He carried out extensive and meticulous field work, which was continued long after formal retirement, gave deep consideration to the data and presented his results in papers which are models of precision and clarity.

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