scholarly journals Paleosecular variation of brunhes age lava flows from British Columbia, Canada

2002 ◽  
Vol 3 (12) ◽  
pp. 1-14 ◽  
Author(s):  
Victoria Mejia ◽  
Rene W. Barendregt ◽  
Neil D. Opdyke
Keyword(s):  
British Columbia ◽  
Lava Flows ◽  
Paleosecular Variation

Holocene paleosecular variation from dated lava flows on Maui (Hawaii)

2007 ◽  
Vol 161 (3-4) ◽  
pp. 267-280 ◽  
Author(s):  
Emilio Herrero-Bervera ◽  
Jean-Pierre Valet
Keyword(s):  
Lava Flows ◽  
Paleosecular Variation

scholarly journals Paleosecular variation and time-averaged field recorded in late Pliocene-Holocene lava flows from Mexico

2005 ◽  
Vol 6 (7) ◽  
pp. n/a-n/a ◽  
Author(s):  
V. Mejia ◽  
H. Böhnel ◽  
N. D. Opdyke ◽  
M. A. Ortega-Rivera ◽  
J. K. W. Lee ◽  
...  
Keyword(s):  
Lava Flows ◽  
Paleosecular Variation ◽  
Late Pliocene

The age of the Tseax volcanic eruption, British Columbia, Canada

2020 ◽  
Vol 57 (10) ◽  
pp. 1238-1253
Author(s):  
Glyn Williams-Jones ◽  
René W. Barendregt ◽  
James K. Russell ◽  
Yannick Le Moigne ◽  
Randolph J. Enkin ◽  
...  
Keyword(s):  
British Columbia ◽  
Volcanic Eruption ◽  
Radiocarbon Dating ◽  
Wood Charcoal ◽  
Lava Flows ◽  
Geochemical Data ◽  
Effusive Eruption ◽  
Eruptive Episode ◽  
Significant Difference ◽  
Tephra Deposits

A recent volcanic eruption occurred at Tseax volcano that formed a series of tephra cones in northwestern British Columbia, Canada. The explosive to effusive eruption also formed a 32 km long sequence of Fe-rich Mg-poor basanite–trachybasalt lavas covering ∼40 km2. Oral histories of the Nisg_a’a Nation report that the eruption may have caused as many as 2000 fatalities. The actual eruption date and question of whether there was one or multiple eruptive episodes in the 14th and 18th centuries are, as of yet, unresolved. New radiocarbon dating of wood charcoal from immediately beneath vent-proximal tephra deposits and complementary age information suggest an eruption in 1675–1778 CE (95.4% probability) was responsible for the formation of the tephra cone. New paleomagnetic and geochemical data from the tephra cone and lava flows suggest there is, in fact, no statistically significant difference in time between the explosive and effusive deposits and that they formed during a single eruptive episode.

Paleointensity study of late Miocene igneous rocks from British Columbia, Canada

1970 ◽  
Vol 7 (1) ◽  
pp. 176-181 ◽  
Author(s):  
D. T. A. Symons ◽  
E. J. Schwarz
Keyword(s):  
Magnetic Field ◽  
British Columbia ◽  
North America ◽  
Late Miocene ◽  
Igneous Rocks ◽  
Lava Flows ◽  
Basaltic Lava ◽  
Remanent Magnetism ◽  
South Central ◽  
Demagnetizing Fields

Sixty-nine specimens representing 49 late Miocene (10–15 m.y. ago) basaltic lava flows and 4 associated gabbroic intrusive plugs were studied in an attempt to estimate the paleointensity of the earth's magnetic field in south-central British Columbia. The paleointensity determination was based on the comparison of the decay of natural remanent magnetism intensity with that of an artificial thermoremanent magnetism (H = 0.35 Oe) in progressively higher alternating demagnetizing fields (peak: 800 Oe). Only 22 of the 69 specimens were considered to yield reliable paleointensity determinations which give an estimated average equatorial intensity for the late Miocene earth's field of 0.18 Oe ± 0.11. This result agrees reasonably well with those from contemporaneous rocks from North America, Japan, and Iceland. Several low determinations with consistent, normal, or reversed remanence directions suggest that the intensity of the non-dipole components of the late Miocene earth's field must have been very small in the sampled area.

Nazko cone: a Quaternary volcano in the eastern Anahim Belt

1987 ◽  
Vol 24 (12) ◽  
pp. 2477-2485 ◽  
Author(s):  
J. G. Souther ◽  
J. J. Clague ◽  
R. W. Mathewes
Keyword(s):  
British Columbia ◽  
North America ◽  
Volcanic Activity ◽  
Mantle Source ◽  
Volcanic Belt ◽  
Lava Flows ◽  
Radiocarbon Dates ◽  
Depleted Mantle ◽  
Late Neogene ◽  
Cordilleran Ice Sheet

Nazko cone, located in central British Columbia at the eastern end of the Anahim Volcanic Belt, is the product of at least three episodes of Quaternary volcanic activity. An eroded Pleistocene subaerial flow at the base of the pile is overlain by a subglacial mound of hyaloclastite that is, in turn, partly covered by a younger composite pyroclastic cone and associated lava flows. A whole-rock K–Ar date of 0.34 ± 0.03 Ma on the oldest flow is consistent with a hotspot model for the Anahim Belt and implies absolute late Neogene motion of 2.6 cm/year for North America. The hyaloclastite mound was erupted beneath the Cordilleran Ice Sheet during the Late Pleistocene, perhaps during the Fraser Glaciation (25 000 – 10 000 years BP). Radiocarbon dates from peat above and below Nazko tephra in a bog near the cone suggest that the volcano last erupted about 7200 years BP.Nazko basalt has 10–15% normative nepheline and is classified as basanite. This is significantly more undersaturated than basalts farther west in the Anahim Belt and may indicate an eastward shift toward a deeper or less depleted mantle source.

Geomagnetic paleosecular variation at Hawaii around 3 Ma from a sequence of 107 lava flows at Kaena Point (Oahu)

1999 ◽  
Vol 170 (4) ◽  
pp. 365-376 ◽  
Author(s):  
Carlo Laj ◽  
Hervé Guillou ◽  
Nadia Szeremeta ◽  
Robert Coe
Keyword(s):  
Lava Flows ◽  
Paleosecular Variation

scholarly journals Paleosecular variation recorded by Quaternary lava flows from Guadeloupe Island

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Julia Ricci ◽  
Julie Carlut ◽  
Jean-Pierre Valet
Keyword(s):  
Lava Flows ◽  
Paleosecular Variation
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