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  • noun

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an isogram connecting points at which something occurs or arrives at the same time

References in periodicals archive ?
Xu, "Sm-Nd isochron for the amphibolites within Taihua complex from Xiao Qinling area, Western Henan and its geological implications," Geochimica et Cosmochimica Acta, vol.
Moreover, Rb-Sr isochron method of altered minerals has been widely used in the study of the mineralization age of gold deposits (Jager, 1979; Andre and Deutsch, 1986; Wei et al., 1997; Yang and Zhou, 1999; Xie and Hu, 2000; Wang et al., 2002).
The RATE group shows large discordances in isochron estimates of the age of rocks and minerals to be normative and as large as factors of two or three in some cases, much larger than the 15% Isaac stated in his review.
North Dakota, yielded a Re-Os isochron age of 354 [+ or -] 49 Ma ([lambda] = 1.52 x [10.sup.-11][a.sup.-1]) which is within uncertainty of the known stratigraphic age of ~350 Ma.
four products are Bisochron, Isochron, Hepacol I and Hepacol
64) with the corrected figure describing the "isochron" lines for various time-of-arrival differences at baseline sites in a time-difference-of-arrival (TDOA) emitter-location system.
TELECOMWORLDWIRE-6 May 2003-Socket and Isochron team for product integration(C)1994-2003 M2 COMMUNICATIONS LTD
According to Jim Munnell, vice president of sales and customer operations for Isochron, the desire for "instant gratification" is a big inhibitor to success.
Multiple crosschecking methods, such as the isochron and the concordia-discordia methods, allow geologists to place a high degree of confidence in radiometric measurements.
Isochron Data Corp., through its installed system transmits data ranging from temperature of the machine, cash and product inventory to status of the dollar-bill changer and maintenance requirements.
Available geophysical data suggest that the Newfoundland Basin contains a zone approximately 150 kilometers wide of thinned continental crust separating known Grand Banks continental crust from known oceanic crust seaward of a mid-Cretaceous period (about 118 million years ago) isochron, a magnetic anomaly known as MO.
Rb-Sr dating of sphalerite, in a quartz vein, yielded an isochron age of 116 Ma [17] that is appreciably younger than the 139 to ~140 Ma Mesozoic granitoids and does not support ore formation through magmatic-hydrothermal processes.
This work was done in the early days of geochronological work in Cape Breton Island, and the authors were much influenced by an Rb-Sr isochron using a range of rock types which indicated an age of about 446 Ma.