## 4 Results  
### Petrographic Characteristics  
We collected 23 samples from the northern, central, southern, southwestern, and southeastern parts of the pluton. The muscovite monzogranites (samples P22-55 GS, P22-71 GS, P20-15 GS, and D3801 GS01) are gray-white with fine-grained hypidiomorphic-granular and massive structures. Euhedral plagioclase (30-35%) crystals have dimensions of 0.1 \(\times\) 0.25-1 \(\times\) 2.3 mm; some are replaced by sercite. Interstitial microcline (30%; 0.1-2 \(\times\) 4.5 mm) is associated with biotite, plagioclase, and quartz. Fine albite stripes are distributed within coarse microcline grains. Quartz grains (25-30%; 0.05-1 \(\times\) 0.5 mm) are xenomorphic-granular and exhibit strong wavy extinction. Muscovite (5%; 0.05 \(\times\) 0.2-0.4 \(\times\) 1.1 mm) is flaky. Flaky biotite (1-5%) is sometimes replaced by chlorite. Small amounts of apatite and white titanium were also observed. The mica monzogranites (samples P22-39 XT01, P26-88 GS, P20-19 GS, P20-03 GS, and P11-15 GS01) are gray-white, with fine-grained hypidiomorphic-granular and massive structures. Mineral grain sizes are 0.05-1.7 \(\times\) 3.5 mm; however, samples are predominantly composed of fine-grained minerals. Plagioclase (30-35%) is euhedral and ranges in size; potassium feldspar (20-25%) exhibits irregular shapes; inclusions of microcline and striped feldspar often replaced interstitial plagioclase. Quartz (25%) is allotriomorphic-granular and exhibits strong wavy extinction. Muscovite (10-15%) is flaky, variable in size, and has an uneven distribution. Biotite (5%) is flaky and commonly replaced by chlorite, with residual visible crystals. A small amount of apatite is also present, along with sericite exhibiting strong wavy extinction. Reticular cracks are filled a small amount of calcite. The biotite granodiorite (samples P25-08 XT01, P25-1-05 GS, and D259 GS) is gray-white, with medium to fine-grained hypidiomorphic and massive structures. The main mineral components are plagioclase (45%), microcline (20-25%), quartz (25-30%), biotite (5%), and amphibole (1%). Mineral grains are 0.1-4.5 \(\times\) 5 mm in size; medium-grained minerals (>2 mm) account for \(\sim\)45% of the total. Some euhedral plagioclase are replaced by sericite, which has a random distribution. Microcline is irregular and interstitial, and is associated with plagioclase and biotite. Quartz is irregular, exhibits strong wavy extinction, and is associated with plagioclase and biotite. Biotite is flaky, and some grains are replaced by chlorite. Other minerals include small amounts of euhedral amphibole, epidote, spine, and apatite. Samples are jointed and the surface is locally affected by spherical weathering. The biotite monzogranite (sample P25-12 GS) is gray-white with medium-fine-grained hypidiomorphic-granular and massive structures. The main mineral components are plagioclase (30-35%), microcline (25%), quartz (30-35%), biotite (10-15%), and amphibole (1%). Plagioclase crystals are elongate and exhibit ring structures; some grains are replaced by sericite and zoisite. Microcline is interstitial to plagioclase and biotite. Quartz is irregular and exhibits strong wavy extinction. Biotite is flaky, and some grains are replaced by chlorite. Some amphibole grains are associated with biotite. Epidote, apatite, spine, and a small number of other minerals are also present. Samples are jointed and the surface is locally affected by alteration. The biotite quartz diorite (samples P21-20 GS and P23-01 GS01) is gray with medium-fine-grained hypidiomorphic-granular and massive structures. The mineral grains are 0.1-2.1 \(\times\) 3.1 mm in size; medium-grained minerals (>2 mm) account for 20-25% of the total. Plagioclase (50%) is tabular with variable grain sizes; some grains are replaced by sericite (1-5%). Hornblende (15%) ranges from euhedral to irregular in shape, and is associated with biotite. Biotite (15-20%) is flaky and randomly distributed. Quartz (15-20%) is interstitial, exhibits strong wavy extinction, and has an uneven distribution.