VOLUME XXX NUMBER 7 



THE 



JOURNAL OF GEOLOGY 



October-November ig22 



THE NEPHELITE SYENITE AND NEPHELITE 

 PORPHYRY OF BEEMERVH^LE, NEW JERSEY 



M. AUROUSSEAU and HENRY S. WASHINGTON 

 Geophysical Laboratory, Carnegie Institution of Washington 



OUTLINE 



Introduction 



The Nephelite Syenite of the Beemerville Mass 



The Nephelite Porphyry 



Crystallization Variants of the Beemerville Magma 



The Occurrence of Zirconia and Rare Earths 



The Status of Sussexite 



Summary 



INTRODUCTION 



During the earlier geological survey of New Jersey many outcrops 

 of igneous rocks, mainly dykes, were mapped and recorded in the 

 state reports without particular description. These rocks are 

 nearly all located in Sussex County, and, owing to the small size 

 of most of the outcrops, their scattered nature, the maturity of the 

 topography, and the extent of weathering of the rocks themselves, 

 their interesting nature has only been recognized gradually, though 

 the first record of the largest mass dates back to 1868. 



Through the work of Emerson, Kemp, and Wolff these rocks 

 are now widely known and are regarded in the local sense as a suite 

 of genetically connected alkalic intrusions, and more generally as 



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