a volcanic literature of the body as well as the heart

What does "volcanic literature of the body" mean in the text below?
Is the writer saying Charlotte Bronte devoted a great deal of her writings to describing body and sensations?

In rejecting Austen and deciding instead to write about "what throbs fast and full, though hidden, what the blood rushes through, what is the unseen seat of life," Charlotte Bronte had chosen a volcanic literature of the body as well as of the heart, a sexual and often supernatural world. She was thus seen as the romantic, the spontaneous artist who "pours forth her feelings . . . without premeditation." George Eliot was seen as the opposite: a writer and a woman in the Austen tradition, studied, intellectual, cultivated.

— Showalter, Elaine. "The Double Critical Standard and the Feminine Novel," in A Literature of Their Own: British Women Novelists From Brontë to Lessing, pp. 73-99. Princeton, N. J.: Princeton University Press, 1977, via encyclopedia.com