Fig. 7. Parts per million Sr, Rb, Ba, Mn, Pb, Ni, Co, Mo, Zn, and Cu and parts per billion Hg and Au plotted against weight % SiO₂ for rock samples in the diorite-gabbro wall rock (solid black circles). For diagrams that include Sr and Rb data, the sample numbers have been differently designated and separated into three fields. These include diorite wall rocks from Table VI in Collins (1988). Solid circles indicate diorite , sample nos. 14 and 15; open circle indicates sample no. 16 (foliated diorite adjacent to the Isabella pluton). Black squares indicate diorite (nos. 33, 40, and 44); squares shaded in the northwest half indicate transition rocks (nos. 34, 38, and 39); and squares shaded in the southeast half indicate migmatized diorite and aplite dike samples (nos. 35, 36, 37, 41, 42, and 43). For diagrams that include Sr, Rb, and Ba, the open triangles represent other diorite-gabbro wall rock samples shown in Tables VI and VII in Collins (1988). Arrows in the diagrams showing Sr and Rb data indicate trend of subtraction of Rb and enrichment in Sr during shearing and recrystallization in the diorite-gabbro followed by enrichment of Rb and subtraction of Sr during the subsequent replacement of these rocks to produce the granitic rocks in the aplite-pegmatite dike.