geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Errors in paleomagnetism; structural control on overlapped vectors; mathematical models


, : Errors in paleomagnetism; structural control on overlapped vectors; mathematical models. Physics of the Earth and Planetary Interiors 186.1-2

The reliability of paleomagnetic data is a keystone to obtain trustable kinematics interpretations. The determination of the real paleomagnetic component recorded at certain time in the geological evolution of a rock can be affected by several sources of errors: inclination shallowing, declination biases caused by incorrect restoration to the ancient field, internal deformation of rock volumes and lack of isolation of the paleomagnetic primary vector during the laboratory procedures (overlapping of components). These errors will limit or impede the validity of paleomagnetism as the only three-dimension reference. This paper presents the first systematic modeling of the effect of overlapped vectors referred to declination, inclination and stability tests taking into account the key variables: orientation of a primary and secondary (overlapped to the primary) vectors, degree of overlapping (intensity ratio of primary and secondary paleomagnetic vectors) and the fold axis orientation and dip of bedding plane. In this way, several scenarios of overlapping have been modeled in different fold geometries considering both polarities and all the variables aforementioned, allowing to calculate the deviations of the vector obtained in the laboratory (overlapped) with respect to the paleomagnetic reference (not overlapped). Observations from the models confirm that declination errors are larger than the inclination ones. In addition to the geometry factor, errors are mainly controlled by the relative magnitude of the primary respect to the secondary component (P/S ratio). We observe larger asymmetries and bigger magnitudes of errors along the fold location if the primary and secondary records have different polarities. If the primary record (declination) and the fold axis orientation are perpendicular (Omega =90 degrees ), errors reach maximum magnitudes and larger asymmetries along the fold surface (different dips). The effect of overlapping in the fold and reversal tests is also qualitatively analyzed in this paper.

US$19.90

DOI: 10.1016/j.pepi.2011.02.003


Other references

Gill T.J.IIi; Kunz H.W., 1979: Evidence for t t like complex in the rat. Transplantation Proceedings 11(3): 1608-1610

Yoon, H.In.; Chang, J.Suk.; Lim, J.Seok.; Noh, S.Hoon.; Hyung, W.Jin.; An, J.Yeong.; Lee, Y.Chan.; Rha, S.Young.; Kim, K.Hwan.; Koom, W.Sub., 2014: Defining the target volume for post-operative radiotherapy after D2 dissection in gastric cancer by CT-based vessel-guided delineation. To determine the recurrent nodal gross tumor volume (rnGTV) based on CT-guided vascular structure to refine the clinical target volume (CTV) delineation in postoperative radiotherapy for advanced gastric cancer following radical gastrectomy with D...

Good, R.E.; Good, N.F., 1971: Vegetation of a Minnesota prairie and a comparison of methods. The vegetation of Felton Prairie is described and data obtained by the point-centred quarter method are compared with data obtained from quadrats. 2 community types were sampled. The more xeric type was dominated by Bouteloua gracilis and Stipa co...

Anonymous, 1967: Record of research for the period 1 Jan. to 31 Dec. 1966. Annual report 1966. DAGG, M.; BLACKIE, J. R.; WANGATI, F. J. Crop water use, pp. 13-18, bibl. 2. At Muguga, Kenya, little water was used by maize beyond the soil depth of 4.5 ft until after tasselling when water was absorbed from depths up to 6.5 ft. 2. SCHUMAKER, G....

GuiDaFang; FuMianXing; ChenKaoKe; LiuKe, 2008: Evaluation of germplasm resources and fruit utilization of species in Elaeagnus L. in Guangdong Province. Based on field investigation and specimen consulting, the status of plant resources of Elaeagnus L. in Guangdong Province are comprehensively evaluated, and contents of nutrient constituents, including mineral elements, amino acids etc., in fruit...

McDonnell, R.; Johnson, Z.; Doyle, A.; Sayers, G., 1999: Determinants of folic acid knowledge and use among antenatal women. Folic acid knowledge and use, and their determinants among antenatal women in the east of Ireland in 1997, were examined. 300 antenatal women attending their initial booking appointment in three Dublin maternity hospitals were surveyed. An intervi...

Shuaib A.; Lee M.A., 1990: Recurrent peripheral facial nerve palsy after dental procedures. Peripheral facial palsy is an uncommon complication of dental procedures. Most cases begin immediately after dental anesthesia and resolve within 12 hours. No report of recurrent facial palsy with dental manipulations has previously been described...

Humphreys, R.P.; Creighton, R.E.; Hendrick, E.B.; Hoffman, H.J., 1975: Advantages of the prone position for neurosurgical procedures on the upper cervical spine and posterior cranial fossa in children. The authors have reviewed the charts of 107 patients undergoing 119 surgical procedures in the prone position for posterior fossa or upper cervical lesions. The intraoperative complications encountered include cardiac arrhythmia, respiratory compl...

Porter R.H.P.; Roberts P.J.; Briggs R.S.J., 1991: Modulation of tritiated cpp binding by nmda receptor complex ligands. British Journal of Pharmacology 104(PROC SUPPL DEC): ABSTRACT 338P

Giarola, A., 1983: Indications for hormone therapy of female secretory sterility. Female dysendocrine sterility has displayed a statistical incidence of 3.4% since 1967 in Milan's fertility and sterility centres. It is always marked by clear-cut clinical situations. Of these, particular interest is attached to anovulation...