TRACE ELEMENT GEOCHEMISTRY AND PETROGENESIS OF FELSIC VOLCANIC ROCKS ASSOCIATED WITH VOLCANOGENIC MASSIVE Cu-Zn-Pb SULFIDE DEPOSITS

2004 ◽  
Vol 99 (5) ◽  
pp. 1003-1013 ◽  
Author(s):  
T. R. Hart ◽  
H. L. Gibson ◽  
C. M. Lesher
Keyword(s):  
Trace Element ◽  
Volcanic Rocks ◽  
Trace Element Geochemistry ◽  
Element Geochemistry ◽  
Sulfide Deposits ◽  
Felsic Volcanic ◽  
Felsic Volcanic Rocks

The zircon SHRIMP chronology and trace element geochemistry of the Carboniferous volcanic rocks in western Tianshan Mountains

2005 ◽  
Vol 50 (19) ◽  
pp. 2201-2212 ◽  
Author(s):  
Yongfeng Zhu ◽  
Lifei Zhang ◽  
Libing Gu ◽  
Xuan Guo ◽  
Jing Zhou
Keyword(s):  
Trace Element ◽  
Volcanic Rocks ◽  
Tianshan Mountains ◽  
Trace Element Geochemistry ◽  
Element Geochemistry ◽  
Western Tianshan

A Cambrian island arc in Iapetus: geochronology and geochemistry of the Lake Ambrose volcanic belt, Newfoundland Appalachians

1991 ◽  
Vol 128 (1) ◽  
pp. 1-17 ◽  
Author(s):  
G. R. Dunning ◽  
H. S. Swinden ◽  
B. F. Kean ◽  
D. T. W. Evans ◽  
G. A. Jenner
Keyword(s):  
Volcanic Rocks ◽  
Volcanic Belt ◽  
Detailed Examination ◽  
Island Arc ◽  
Trace Element Geochemistry ◽  
Geochemical Type ◽  
Element Geochemistry ◽  
South Central ◽  
Iapetus Ocean ◽  
Felsic Volcanic

AbstractThe Lake Ambrose volcanic belt (LAVB) outcrops as a 45 km long northeast-trending belt of mafic and felsic volcanic rocks along the eastern side of the Victoria Lake Group in south-central Newfoundland. It comprises roughly equal proportions of mafic pillow basalt and high silica rhyolite, locally interbedded with epiclastic turbidites. Volcanic rocks have been metamorphosed in the greenschist facies and are extensively carbonatized.U-Pb (zircon) dates from rhyolite at two, widely separated localities give identical ages of 513 ± 2 Ma (Upper Cambrian), and this is interpreted as the eruptive age of the volcanic sequence. Primitive arc and low-K tholeiites can be recognized on the basis of major and trace element geochemistry, ranging from LREE-depleted to LREE-enriched. Geochemical variation between mafic volcanic types is interpreted predominantly to reflect contrasts in source characteristics and degree of partial melting; some variation within each geochemical type attributable to fractional crystallization can be recognized. Detailed examination of some samples indicates that the heavy REE and related elements have locally been mobile, probably as a result of carbonate complexing.The LAVB is the oldest well-dated island arc sequence in Newfoundland, and perhaps in the Appalachian–Caledonian Orogen. Its age requires modification of widely held models for the tectonic history of central Newfoundland. It is older than the oldest known ophiolite, demonstrating that arc volcanism was extant before the generation of the oldest known oceanic crust in this part of Iapetus. It further demonstrates that there was a maximum of approximately 30 Ma between the rift-drift transition which initiated Iapetus, and the initiation of subduction. This suggests that the oceanic sequences preserved in Newfoundland represent a series of arcs and back arc basins marginal to the main Iapetus Ocean, and brings into question whether the Appalachian accreted terranes contain any remnants of normal mid-ocean ridge type Iapetan crust.

A petrological and geochemical study of the volcanic rocks of the Crowsnest Formation, southwestern Alberta, and of the Howell Creek suite, British Columbia

2006 ◽  
Vol 43 (11) ◽  
pp. 1621-1637 ◽  
Author(s):  
Melissa Bowerman ◽  
Amy Christianson ◽  
Robert A Creaser ◽  
Robert W Luth
Keyword(s):  
British Columbia ◽  
Trace Element ◽  
Isotope Geochemistry ◽  
Source Region ◽  
Volcanic Rocks ◽  
Trace Element Geochemistry ◽  
Element Geochemistry ◽  
Geochemical Study ◽  
Geological Sciences ◽  
Ree Patterns

Alkaline igneous rocks of the Crowsnest Formation in southwestern Alberta and in the Howell Creek area in southeastern British Columbia have been suggested previously to be cogenetic. To test this hypothesis, samples of both suites were characterized petrographically and their major and trace element geochemistry was determined. A subset of the samples was analyzed for whole-rock Sr and Nd isotope geochemistry. The samples of the two suites are latites, trachytes, and phonolites based on the International Union of Geological Sciences (IUGS) total alkalis versus silica (TAS) diagram. Samples from both suites show similar patterns on mantle-normalized trace element diagrams, being enriched relative to mantle values but depleted in the high field-strength elements Nb, Ta, and Ti relative to the large-ion lithophile elements. The chondrite-normalized rare-earth element (REE) patterns for both suites are light REE enriched, with no Eu anomaly and flat heavy REE. The isotope geochemistry of both suites is characterized by low initial 87Sr/86Sr (SrT = 0.704 to 0.706) and low εNdT (–7 to –16). The Howell Creek samples have lower εNdT and higher SrT than do the Crowsnest samples. Based on the intra- and intersuite differences in the isotope geochemistry, we conclude that these samples are not cogenetic, but rather represent samples that have experienced similar evolutionary histories from a heterogeneous source region in the subcontinental lithospheric mantle.

Trace element geochemistry of Cenozoic volcanic rocks in Shandong Province

1989 ◽  
Vol 8 (3) ◽  
pp. 254-266
Author(s):  
Chen Daogong ◽  
Li Binxian ◽  
Zhang Xun
Keyword(s):  
Trace Element ◽  
Volcanic Rocks ◽  
Shandong Province ◽  
Trace Element Geochemistry ◽  
Element Geochemistry

scholarly journals Trace-Element Geochemistry of Volcanic Rocks from Site 786: The Izu-Bonin Forearc

1992 ◽  
Author(s):  
B.J. Murton ◽  
D.W. Peete ◽  
R.J. Arculus ◽  
J.A. Pearce ◽  
S. van der Laan
Keyword(s):  
Trace Element ◽  
Volcanic Rocks ◽  
Trace Element Geochemistry ◽  
Element Geochemistry
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