Zircons from the Copper Flat Intrusion, Hillsboro, New Mexico

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Title: Zircons from the Copper Flat Intrusion, Hillsboro, New Mexico
Author: Wilbanks, John Randall
Abstract: Zircon crystal growth trends of the Copper Flat quartz monzonite intrusion , Hillsboro , New Mexico , are more variable near the intrusive contacts than toward the central portion of the intrusion . Length and width measurements of zircon crystals recovered from 36 samples were statistically treated using the method of the reduced major axis . Eight of the 36 samples have reduced major axes significantly different from the mean growth trend calculated for 34 of the 36 samples . Six of these eight samples were obtained from locations and elevations near the roof of the intrusion . The other two samples represent material from the bottom of holes drilled near an inward -sloping contact of the intrusion . Because zircon is an early -forming mineral in granitic magmas , different physico -chemical conditions , particularly water concentration near the intrusive margins , are thought to control growth patterns . Fewer differences in zircon growth trends are found near the central portion of the intrusion , reflecting the more uniform environment during zircon crystallization . The two anomalous samples from greater depths may represent the marginal fades of the intrusion , thus supporting the hypothesis that the intrusion is a funnel -shaped pluton .
URI: http : / /hdl .handle .net /2346 /20265
Date: 1966-05

Citation

Zircons from the Copper Flat Intrusion, Hillsboro, New Mexico. Master's thesis, Texas Tech University. Available electronically from http : / /hdl .handle .net /2346 /20265 .

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