TY - JOUR
T1 - Critical evaluation of segregation vesicles in mid-ocean ridge basalts as a rock orientation tool (palaeomagnatism)
AU - Van Wagoner, Nancy A.
PY - 1983
Y1 - 1983
N2 - Segregation vesicles in seafloor basalts generally are spherical in shape, and partly filled with a dark, cup-shaped meniscus of chilled residual melt. The orientation of the meniscus can be used as an indicator of the cooling orientation of the rock. Results of statistical tests on samples previously oriented by megascopic geopetal features indicate that the meniscuses in segregation vesicles of a given rock sample are preferentially oriented about the earth's gravity field, as indicated by the megascopic features. As well, the distributions of magnetic inclinations of rocks oriented by megascopic features and segregation vesicles are similar. The segregation vesicle technique can be used to orient dredge and submersible samples for paleomagnetic polarity studies and to determine the dip and predeformational magnetic inclination of rocks recovered in drill cores, which have a known, in-place vertical orientation, if care is taken to select samples properly. A simple method for application of this technique is presented. - from Author
AB - Segregation vesicles in seafloor basalts generally are spherical in shape, and partly filled with a dark, cup-shaped meniscus of chilled residual melt. The orientation of the meniscus can be used as an indicator of the cooling orientation of the rock. Results of statistical tests on samples previously oriented by megascopic geopetal features indicate that the meniscuses in segregation vesicles of a given rock sample are preferentially oriented about the earth's gravity field, as indicated by the megascopic features. As well, the distributions of magnetic inclinations of rocks oriented by megascopic features and segregation vesicles are similar. The segregation vesicle technique can be used to orient dredge and submersible samples for paleomagnetic polarity studies and to determine the dip and predeformational magnetic inclination of rocks recovered in drill cores, which have a known, in-place vertical orientation, if care is taken to select samples properly. A simple method for application of this technique is presented. - from Author
UR - http://www.scopus.com/inward/record.url?scp=0020842852&partnerID=8YFLogxK
U2 - 10.1029/JB088iB10p08318
DO - 10.1029/JB088iB10p08318
M3 - Article
AN - SCOPUS:0020842852
SN - 0148-0227
VL - 88
SP - 8318
EP - 8332
JO - Journal of Geophysical Research
JF - Journal of Geophysical Research
IS - B10
ER -