The phrase "immense accumulation of" is correct and usable in written English.
It can be used to describe a large gathering or collection of something, often in a context where the quantity is significant.
Example: "The museum displayed an immense accumulation of artifacts from ancient civilizations."
Alternatives: "vast collection of" or "large gathering of".
"In societies where modern conditions of production prevail," goes its opening passage, "all of life presents itself as an immense accumulation of spectacles.
"The whole life of those societies in which modern conditions of production prevail presents itself as an immense accumulation of spectacles.
"Mahfouz's Egypt," Said wrote, "is an immense accumulation of history... and despite the astounding variety of its rulers, regimes, religions and races, nevertheless retains its own coherent identity".
KARL MARX began "Das Kapital" by noting that the wealth of capitalist societies presents itself as "an immense accumulation of commodities".
Beijing continues to peg the value of its currency to the dollar, despite an immense accumulation of foreign reserves and a persistent surplus in China's account equal to about 10.5 percent of its annual economic output, a surplus that in standard monetary theory would prompt China to allow its currency to rise.
Recently, descendants of Wilde, the Irish dramatist and wit who died here in 1900, decided to have his immense gravestone cleansed of a vast accumulation of lipstick markings from kisses left by admirers, who for years have been defacing, and some say eroding, the memorial in hilly Père Lachaise Cemetery here.
The change in the character of property made easier the concentration of property, the accumulation of immense wealth in the hands of a relative few, and, not least, the possibility of economic domination of politics and culture.
In analogy to the biodiesel industry, immense rise in global bioethanol production has led to the accumulation of thin stillage, the aqueous fraction of whole stillage and an inexpensive waste product possessing a high proportion of unpurified, fermentable glycerol [ 8].
The accumulation of greater wealth in the hands of a smaller percentage of the world's population has created immense fortunes with a limitless capacity to pursue a limited supply of art work.
An accumulation of nameless energies".
"All the accumulation of projects.
