Paleomagnetism of Cretaceous Basalts from the East Mariana Basin, Western Pacific Ocean .

Wallick, Brian P.; Steiner, Maureen B.

doi:10.2973/odp.proc.sr.129.134.1992

Cited by 5 publications

(3 citation statements)

References 14 publications

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“…[26] Paleomagnetic investigations of Hole 801C began during ODP Leg 129 and the results of the basalt measurements were summarized by Wallick and Steiner [1992] and Larson et al [1992a] (with a correction of figures in Larson et al [1992b]). Two polarity groups were observed and mean inclinations for this southern hemisphere site were estimated at 27.1 6 6.9 and À34.8 6 6.9 for the reverse and normal inclination groups, respectively.…”

Section: Paleolatitude Of Odp Site 801mentioning

confidence: 99%

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Paleointensity results from the Jurassic: New constraints from submarine basaltic glasses of ODP Site 801C

Tauxe

Gee

Steiner

et al. 2013

Geochem Geophys Geosyst

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Tholeiite of the oldest oceanic crust was drilled during ODP Legs 129 and 185 at Hole 801C in the western Pacific. Fresh appearing submarine basaltic glass (SBG) was recovered from the tholeiites (∼167 Ma) which has been shown to be nearly ideal for determining absolute paleointensity. Paleointensities of the younger, off‐axis, alkalic basalts (∼160 Ma), overlying the tholeiites, had been studied earlier. Here we report results from the older tholeiitic (on‐axis) sequence. We subjected a total of 73 specimens from 17 cooling units to absolute paleointensity experiments. Of these, 30 specimens and six cooling unit averages met our strictest reliability criteria, yielding an average of 11.9 ± 3.9 μT. The bulk of evidence suggests a paleolatitude of the site of 14°S (with an uncertainty of 10°). This translates the intensity to a value for the virtual axial dipole moment of 28 ZAm2, slightly lower than values determined from the plagioclase crystals in the three cooling units of the younger alkalic basalts overlying the tholeiites (Tarduno & Cottrell, 2005). Our value is low when compared to the long‐term median value of the field of 42 ZAm2. Our results and those of the published literature therefore support the contention of a low magnetic field strength in the Jurassic (average of 28 ± 14 ZAm2; N = 138 individual estimates), as initially suggested by Prévot et al. (1990). Our interpretation of the body of available data argue for low field strengths for the entire Jurassic extending into the early Cretaceous.

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Section: Paleolatitude Of Odp Site 801mentioning

confidence: 99%

“…Paleomagnetic investigations of Hole 801C began during ODP Leg 129 and the results of the basalt measurements were summarized by Wallick and Steiner [] and Larson et al . [] (with a correction of figures in Larson et al .…”

Section: Paleolatitude Of Odp Site 801mentioning

confidence: 99%

Paleointensity results from the Jurassic: New constraints from submarine basaltic glasses of ODP Site 801C

Tauxe

Gee

Steiner

et al. 2013

Geochem Geophys Geosyst

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“…Numbers are site numbers. Data sources are: Site 166 (Cox and Gordon, 1984); Site 289 (Hammond et al, 1975); Sites 303 and 304 (Larson and Lowrie, 1975); Sites 800 and 802 (Wallick and Steiner, 1992); Site 843 (Helsley, 1993); Site 865 (Sager, this volume); Sites 872, 878 (2), 879 (Nakanishi and Gee, 1995). Solid circle represents a 125-Ma paleomagnetic pole determined mainly from magnetic anomaly skewness (Petronotis et al, 1992).…”

Section: Discussionmentioning

confidence: 99%

Paleomagnetism of Basaltic Rocks Cored at ODP Site 1179: Implications for Mid-Cretaceous Pacific Plate Paleolatitude and Paleomagnetic Pole

Sager¹,

Horner-Johnson²

2004

Proceedings of the Ocean Drilling Program, 191 Scientific Results

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During Ocean Drilling Program Leg 191, ~100 m of mid-Cretaceous igneous crust was cored at Site 1179 (41.08°N, 159.96°E), located within magnetic Anomaly M8 on the abyssal plain of the northwest Pacific Ocean near Shatsky Rise. Paleomagnetic data from this section are significant because they can constrain the mid-Cretaceous Pacific plate paleolatitude and paleomagnetic pole, both of which can be used to infer tectonic drift and other geodynamic processes. In this study, we analyzed the paleomagnetism of 122 samples from 40 flows in the Site 1179 basalt section. Comparison of inclination data among flows implies 13 independent measurements of the paleomagnetic field. Assuming a reversed magnetic polarity because of the site location within Anomaly M8, the data give a mean paleocolatitude of 88.1° ± 6.8° (corresponding to a paleolatitude of 1.9°N). The paleocolatitude is consistent with other mid-Cretaceous Pacific paleomagnetic data that indicate ~39° northward drift of the western Pacific plate since mid-Cretaceous time. Comparison of observed between-flow colatitude variance with that expected from secular variation data suggests that secular variation may not have been completely averaged with the 13 independent groups sampled at Site 1179. Colatitude scatter in the section is markedly less in the deepest 33 m of the hole, indicating a shift 1 Sager, W.W., and Horner-Johnson, B.C., 2004. Paleomagnetism of basaltic rocks cored at ODP Site 1179: implications for mid-Cretaceous Pacific plate paleolatitude and paleomagnetic pole.

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Long-term variations in palaeointensity

Selkin

Tauxe

2000

Philosophical Transactions of the Royal Society of London. Seri

356

315

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We compile a dataset of reliable palaeointensity estimates based both on published work and on new data from basaltic glass. The basaltic glass data more than double the number of reliable (Thellier method with pTRM checks) palaeointensity estimates available. Although the new data dramatically improve both spatial and temporal coverage, there is still a strong bias toward the most recent past. The last 0.3 Ma claim over half of the data in our combined database. We therefore divide the data into two groups, the densely sampled last 0.3 Myr and the more sparsely sampled period of time comprising roughly half of the data from 0.3 to 300 Ma. Separating them in this way, it is clear that the dipole moment of the Earth over the past 0.3 Myr (ca. 8 10 22 A m 2 ) is dramatically higher than the average dipole moment over the preceding 300 Myr (ca. 5 10 22 A m 2 ). Inclusion of poor-quality results leads to an overestimate of the average dipole moment. Interestingly, no other signi cant changes in the distribution of dipole moments are evident over the 300 million year span of the data.

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Paleomagnetism of Cretaceous Basalts from the East Mariana Basin, Western Pacific Ocean .

Cited by 5 publications

References 14 publications

Paleointensity results from the Jurassic: New constraints from submarine basaltic glasses of ODP Site 801C

Paleointensity results from the Jurassic: New constraints from submarine basaltic glasses of ODP Site 801C

Paleomagnetism of Basaltic Rocks Cored at ODP Site 1179: Implications for Mid-Cretaceous Pacific Plate Paleolatitude and Paleomagnetic Pole

Long-term variations in palaeointensity

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